<PAGE>

                         FIRST AMENDMENT OF CREDIT AGREEMENT

     THIS FIRST AMENDMENT OF CREDIT AGREEMENT (this "AMENDMENT") is entered into
to be effective as of February 26, 1999, between PROTECTION ONE ALARM
MONITORING, INC., a Delaware corporation ("BORROWER"), each of the banks or
other lending institutions which is a signatory to this Amendment (collectively,
"LENDERS"), NATIONSBANK, N.A., a national banking association, as Administrative
Agent for the Lenders (in such capacity, together with its successors in such
capacity, "ADMINISTRATIVE AGENT"), FIRST UNION NATIONAL BANK, a national banking
association, as Syndication Agent (in such capacity, together with its
successors in such capacity, "SYNDICATION AGENT"), and TORONTO DOMINION (TEXAS),
INC., as Documentation Agent (in such capacity, together with its successors in
such capacity, "DOCUMENTATION AGENT").

                                   R E C I T A L S

     A.    Borrower, Lenders, Administrative Agent, Syndication Agent, and
Documentation Agent are parties to the Credit Agreement dated as of December 21,
1998 (as renewed, extended, modified, and amended from time to time, the "CREDIT
AGREEMENT"), providing for a $500,000,000 line of credit.

     B.    Capitalized terms used herein shall, unless otherwise indicated, have
the respective meanings set forth in the Credit Agreement.

     C.    Borrower, Lenders, Administrative Agent, Syndication Agent, and
Documentation Agent desire to modify certain provisions contained in the Credit
Agreement, subject to the terms and conditions set forth herein.

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Borrower, Lenders, Administrative
Agent, Syndication Agent, and Documentation Agent agree as follows:

     1.    AMENDMENTS TO THE CREDIT AGREEMENT.

     (a)   SECTION 1.1 is hereby amended to add the following definitions:

           DOLLAR-EQUIVALENT, at any time, means, (a) any amount denominated in
     Dollars, and (b) for any amount denominated in a Foreign Currency, an
     amount of Dollars into which Administrative Agent determines that it could
     convert the relevant amount of that Foreign Currency by using the
     applicable-quoted-spot rate reported on the appropriate page of the Reuters
     Screen at 11:00 a.m. (London time) three (3) Business Days before the day
     on which the calculation is made.

           FOREIGN CURRENCY means any freely-convertible lawful currency
     acceptable to Administrative Agent, so long as (a) such currency is dealt
     with in the London interbank deposit market, (b) such currency is freely
     transferable and convertible into Dollars in the London foreign exchange
     market, and (c) no central bank or other governmental authorization in the
     country of issue of such currency is required to permit use of such
     currency by Administrative Agent for issuing LCs or honoring drafts
     presented under LCs in such currency; PROVIDED THAT if, after the issuance
     of an LC in a Foreign Currency, the Foreign Currency denominated in such LC
     ceases to be lawful currency freely-convertible into Dollars and is
     replaced by a European single or common currency (the "EURO"), then
     thereafter the Foreign Currency for purposes of such LC shall be the Euro.


<PAGE>

     (b)   SECTION 1.1 is hereby amended to delete the definition of "LC
Exposure" in its entirety and replace such definition with the following:

           LC EXPOSURE means, at any time and without duplication, the SUM
     of (a) the Dollar Equivalent of the aggregate undrawn portion of all
     uncanceled and unexpired LCs, PLUS (b) the Dollar Equivalent of the
     aggregate unpaid reimbursement obligations of Borrower in respect of
     drawings of drafts under any LC; PROVIDED THAT LC Exposure shall
     exclude the Dollar Equivalent of the aggregate undrawn portion of any
     uncanceled or unexpired LCs that have been cash collateralized or for
     which back-up letters of credit have been provided pursuant to
     SECTION 2.2.

     (c)   SECTION 2.2 is hereby deleted in its entirety and replaced with the
following:

           2.2   LC SUBFACILITY.

           (a)   CONDITIONS.  Subject to the terms and conditions of this
     Agreement and applicable Law, Administrative Agent agrees to issue LCs upon
     Borrower's application therefor (denominated in Dollars or, upon Borrower's
     request and subject to this SECTION 2.2, in a Foreign Currency) by
     delivering to Administrative Agent a properly completed Notice of LC and an
     LC Agreement with respect thereto no later than 10:00 a.m. Dallas, Texas
     time three (3) Business Days before such LC is to be issued; PROVIDED THAT
     (i) on any date of determination and after giving effect to any LC to be
     issued on such date, the Commitment Usage (calculated at the then-current
     Dollar-Equivalent of such amount) shall never exceed the Total Commitment
     then in effect, (ii) on any date of determination and after giving effect
     to any LC to be issued on such date, the LC Exposure (calculated at the
     then-current Dollar-Equivalent of such amount) shall never exceed
     $25,000,000, (iii) at the time of issuance of such LC, no Potential Default
     or Default shall exist, (iv) each LC requested by Borrower must be in an
     amount not less than $1,000,000 (or, in the case of an LC denominated in a
     Foreign Currency, the Dollar Equivalent of $1,000,000), and (v) each LC
     must expire NO LATER than the EARLIER of the fifteenth (15th) day prior to
     the Termination Date or one (1) year from its issuance; PROVIDED THAT any
     LC may provide for automatic renewal for successive twelve (12) month
     periods (but no renewal period may extend beyond the fifteenth (15th) day
     prior to the Termination Date) unless Administrative Agent has given prior
     notice to the applicable beneficiary of its election not to extend such LC.

           (b)   PARTICIPATION.  Immediately upon the issuance by Administrative
     Agent of any LC, Administrative Agent shall be deemed to have sold and
     transferred to each other Lender, and each other such Lender shall be
     deemed irrevocably and unconditionally to have purchased and received from
     Administrative Agent, without recourse or warranty, an undivided interest
     and participation, to the extent of such Lender's Pro Rata Part, in such LC
     (calculated from time to time at the Dollar-Equivalent of such LC), and all
     Rights of Administrative Agent in respect thereof (OTHER THAN Rights to
     receive certain fees provided for in SECTION 2.2(c)).  Upon the issuance,
     renewal, or extension of an LC, Administrative Agent shall provide copies
     of such LC to each other Lender.

           (c)   REIMBURSEMENT OBLIGATION.  In order to induce Administrative
     Agent to issue and maintain LCs and Lenders to participate therein,
     Borrower agrees to pay or reimburse Administrative Agent (i) on the date on
     which Administrative Agent notifies Borrower of the date and amount of any
     draft presented under any LC, the amount in Dollars (calculated at the
     then-current Dollar-

                                       -2-

<PAGE>

     Equivalent of such amount) of any draft paid or to be paid by 
     Administrative Agent, and (ii) promptly, upon demand, the amount of
     any fees (in addition to the fees described in SECTION 5) which
     Administrative Agent customarily charges to a Person similarly situated in
     the ordinary course of its business for amending LC Agreements, for
     honoring drafts, and taking similar action in connection with letters of
     credit; PROVIDED THAT (A) if Borrower has not reimbursed Administrative
     Agent for any drafts paid or to be paid within twenty-four (24) hours of
     demand therefor by Administrative Agent, then Administrative Agent is
     hereby irrevocably authorized to fund such reimbursement obligations in
     Dollars (calculated at the then-current Dollar-Equivalent of such amount)
     as a Borrowing under the Facility to the extent of availability under the
     Facility, and the proceeds of such Borrowing under the Facility shall be
     advanced directly to Administrative Agent in payment of Borrower's
     reimbursement obligation with respect to the draft under the LC, and (B) if
     for any reason, funds are not advanced pursuant to the Facility, then
     Borrower's reimbursement obligation shall continue to be due and payable.
     Borrower's obligations under this SECTION 2.2(c) shall be absolute and
     unconditional under any and all circumstances and irrespective of any
     setoff, counterclaim, or defense to payment which Borrower may have at any
     time against Administrative Agent (except to the extent resulting from the
     gross negligence or willful misconduct of Administrative Agent) or any
     other Person, and shall be made in accordance with the terms and conditions
     of this Agreement under all circumstances, including, without limitation,
     any of the following circumstances: (1) any lack of validity or
     enforceability of this Agreement or any of the Loan Documents; (2) the
     existence of any claim, setoff, defense, or other Right which Borrower may
     have at any time against a beneficiary named in a LC, any transferee of any
     LC (or any Person for whom any such transferee may be acting), any Credit
     Party (except to the extent resulting from the gross negligence or willful
     misconduct of such Credit Party), or any other Person, whether in
     connection with this Agreement, any LC, the transactions contemplated
     herein, or any unrelated transactions (including any underlying transaction
     between Borrower and the beneficiary named in any such LC); (3) any draft,
     certificate, or any other document presented under the LC proving to be
     forged, fraudulent, invalid, or insufficient in any respect or any
     statement therein being untrue or inaccurate in any respect; and (4) the
     occurrence of any Potential Default or Default.  To the extent any funding
     of a draft has been made by Lenders pursuant to SECTION 2.2(e) or under the
     Facility, Administrative Agent shall promptly distribute any such payments
     received from Borrower with respect to such draft to all Lenders funding
     such draft according to their Pro Rata Part.  Interest on any amounts
     remaining unpaid by Borrower (and unfunded by a Borrowing under the
     Facility) under this CLAUSE at any time from and after the date such
     amounts become payable until paid in full shall be payable by Borrower to
     Administrative Agent at the Default Rate.  In the event any payment by
     Borrower received by Administrative Agent with respect to an LC and
     distributed to Lenders on account of their participations therein is
     thereafter set aside, avoided, or recovered from Administrative Agent in
     connection with any receivership, liquidation, or bankruptcy proceeding,
     each Lender which received such distribution shall, upon demand by
     Administrative Agent, contribute to Administrative Agent such Lender's
     ratable portion of the amount (calculated at the then-current
     Dollar-Equivalent of such amount) set aside, avoided, or recovered,
     together with interest at the rate required to be paid by Administrative
     Agent upon the amount required to be repaid by it.

           (d)   GENERAL.  If any draft shall be presented for honor under any
     LC, then Administrative Agent shall promptly notify Borrower of the date
     and amount (calculated at the then-current Dollar-Equivalent of such
     amount) of such draft; PROVIDED THAT failure to give any such notice shall
     not affect the obligations of Borrower hereunder.  Administrative Agent
     shall make payment upon presentment of a draft for honor unless it appears
     that presentment on its face does not comply 

                                       -3-

<PAGE>

     with the terms of such LC, regardless of whether (i) any default or 
     potential default under any other agreement has occurred, and 
     (ii) the obligations under any other agreement have been performed 
     by the beneficiary or any other Person (and Administrative Agent 
     shall not be liable for any obligation of any Person thereunder).  
     The Credit Parties shall not be responsible for, and Borrower's 
     reimbursement obligations for honored drafts shall not be affected 
     by, any matter or event whatsoever (including, without limitation,
     the validity or genuineness of documents or of any endorsements thereof,
     even if such documents should in fact prove to be in any respect invalid,
     fraudulent, or forged), or any dispute among any Company, the beneficiary
     of any LC, or any other Person to whom any LC may be transferred, or any
     claims whatsoever of any Company against any beneficiary of any LC or any
     such transferee; PROVIDED THAT nothing in this Agreement shall constitute a
     waiver of Borrower's Rights to assert any claim based upon the gross
     negligence or wilful misconduct of any Credit Party.

           (e)   OBLIGATION OF LENDERS.  If Borrower fails to reimburse
     Administrative Agent as provided in SECTION 2.2(c) within twenty-four
     (24) hours after receiving notice of a draft pursuant to SECTION 2.2(d),
     then Administrative Agent shall promptly notify each Lender of such
     failure, of the date and amount (calculated at the then-current
     Dollar-Equivalent of such amount) of the draft paid, and of such Lender's
     Pro Rata Part thereof.  Each Lender shall promptly and unconditionally make
     available to Administrative Agent in immediately available funds such
     Lender's Pro Rata Part of such unpaid reimbursement obligation (calculated
     at the then-current Dollar-Equivalent of such amount), which funds shall be
     paid to Administrative Agent on or before the close of business on the
     Business Day on which such notice was given by Administrative Agent (if
     given at or prior to 1:00 p.m., Dallas, Texas time) or on the next
     succeeding Business Day (if notice was given after 1:00 p.m., Dallas, Texas
     time).  All such amounts payable by any such Lender shall include interest
     thereon accruing at the Federal Funds Rate from the day the applicable
     draft is paid by Administrative Agent to (but not including) the date such
     amount is paid by such Lender to Administrative Agent.  The obligations of
     Lenders to make payments to Administrative Agent with respect to LCs shall
     be irrevocable and are not subject to any qualification or exception
     whatsoever (other than the gross negligence or wilful misconduct of
     Administrative Agent) and shall be made in accordance with the terms and
     conditions of this Agreement under all circumstances, including, without
     limitation, any of the following circumstances: (i) any lack of validity or
     enforceability of this Agreement or any of the Loan Documents; (ii) the
     existence of any claim, setoff, defense, or other Right which Borrower may
     have at any time against a beneficiary named in a LC, any transferee of any
     LC (or any Person for whom any such transferee may be acting), any Credit
     Party, or any other Person, whether in connection with this Agreement, any
     LC, the transactions contemplated herein, or any unrelated transactions
     (including any underlying transaction between Borrower and the beneficiary
     named in any such LC); (iii) any draft, certificate, or any other document
     presented under the LC proving to be forged, fraudulent, invalid, or
     insufficient in any respect or any statement therein being untrue or
     inaccurate in any respect; and (iv) the occurrence of any Potential Default
     or Default.

           (f)   DELIVERY AND CANCELLATION.  Borrower acknowledges that each LC
     will be deemed issued upon delivery to its beneficiary or Borrower.  If
     Borrower requests any LC be delivered to Borrower rather than the
     beneficiary, and Borrower subsequently cancels such LC, then Borrower
     agrees to return it to Administrative Agent together with Borrower's
     written certification that it has never been delivered to such beneficiary.
     If any LC is delivered to its beneficiary pursuant to Borrower's
     instructions, then no cancellation thereof by Borrower shall be effective
     without written consent of such beneficiary to Administrative Agent and the
     return of such LC to Administrative 

                                       -4-

<PAGE>

     Agent.  Borrower hereby agrees that if Administrative Agent becomes 
     involved in any dispute as a result of Borrower's cancellation of any LC, 
     then it shall indemnify the Credit Parties for all losses, costs, 
     damages, expenses, and reasonable attorneys' fees suffered or incurred 
     by the Credit Parties as a direct result thereof.

           (g)   DUTIES OF ADMINISTRATIVE AGENT.  Administrative Agent agrees
     with each Lender that it will exercise and give the same care and attention
     to each LC as it gives to its other letters of credit, and Administrative
     Agent's sole liability to each Lender with respect to such LCs (OTHER THAN
     liability arising from the gross negligence or willful misconduct of
     Administrative Agent) shall be to distribute promptly to each Lender who
     has acquired a participating interest therein such Lender's ratable portion
     of any payments made to Administrative Agent by Borrower pursuant to
     SECTION 2.2(c).  Each Lender and Borrower agree that, in paying any draw
     under any LC, Administrative Agent shall not have any responsibility to
     obtain any document (OTHER THAN any documents required by the respective
     LC) or to ascertain or inquire as to the validity or accuracy of any such
     document or the authority of the Person delivering any such document.  The
     Credit Parties and their respective Representatives shall not be liable to
     any other Credit Party or any Obligor for the use which may be made of any
     LC or for any acts or omissions of any beneficiary thereof in connection
     therewith.  Any action, inaction, error, delay, or omission taken or
     suffered by Administrative Agent or any of its Representatives under or in
     connection with any LC, the draws, drafts, or documents relating thereto,
     or the transmission, dispatch, or delivery of any message or advice related
     thereto, if in good faith and in conformity with such Laws as
     Administrative Agent or any of its Representatives may deem applicable and
     in accordance with the standards of care specified in the UNIFORM CUSTOMS
     AND PRACTICE FOR DOCUMENTARY CREDITS issued by the International Chamber of
     Commerce, as in effect on the date of issue of such LC, shall be binding
     upon Obligors and the Credit Parties and shall not place Administrative
     Agent or any of its Representatives under any resulting liability to any
     Credit Party or any Obligor.  Any action taken or omitted to be taken by
     Administrative Agent under or in connection with any LC if taken or omitted
     in the absence of gross negligence or wilful misconduct shall not create
     for Administrative Agent any resulting liability to any Credit Party or any
     Obligor.

           (h)   CASH COLLATERAL.  On the Termination Date or upon any demand
     from time to time by Administrative Agent or the Required Lenders at any
     time while a Default exists, Borrower shall provide to Administrative
     Agent, for the benefit of Lenders, either (i) cash collateral, or
     (ii) back-up letters of credit reasonably acceptable to Administrative
     Agent, in an aggregate amount equal to one hundred percent (100%) of the LC
     Exposure (calculated at the then-current Dollar-Equivalent of such amount)
     existing on the date of such demand.  Such cash (and all interest thereon)
     and letters of credit shall constitute collateral for all LCs.  Any cash
     collateral deposited, and all interest earned thereon, shall be held by
     Administrative Agent and invested and reinvested at the expense and the
     written direction of Borrower, in United States Treasury Bills with
     maturities of no more than ninety (90) days from the date of investment.
     In the absence of any such direction from Borrower, Administrative Agent
     shall invest the funds held in the cash collateral account (so long as the
     aggregate amount of such funds exceeds any relevant minimum investment
     requirement) in one or more types of investments with such maturities as
     Administrative Agent may specify, pending application of such funds on
     account of any other Obligation, as the case may be.  All such investments
     shall be made in Administrative Agent's name for the account of the Credit
     Parties, subject to the ownership interest therein of Borrower.
     Administrative Agent may liquidate any investment held in the cash
     collateral account in order to apply the proceeds of such investment on
     account of any of the Obligation if such Obligation is then due and payable
     without regard to whether 

                                       -5-

<PAGE>

     such investment has matured and without liability for any penalty or other 
     fee incurred (with respect to which Borrower hereby agrees to reimburse 
     Administrative Agent) as a result of such application.

           (i)   INDEMNIFICATION.  IN ADDITION TO AMOUNTS PAYABLE AS ELSEWHERE
     PROVIDED IN THIS AGREEMENT, BORROWER HEREBY AGREES TO PROTECT, INDEMNIFY,
     PAY, AND SAVE EACH CREDIT PARTY HARMLESS FROM AND AGAINST ANY AND ALL
     CLAIMS, DEMANDS, LIABILITIES, DAMAGES, OR LOSSES OF, OR OWED TO THIRD
     PARTIES, AND ANY AND ALL RELATED COSTS, CHARGES, AND EXPENSES (INCLUDING
     REASONABLE ATTORNEYS' FEES), WHICH ANY CREDIT PARTY MAY INCUR OR BE SUBJECT
     TO AS A CONSEQUENCE, DIRECT OR INDIRECT, OF (A) THE ISSUANCE OF ANY LC, OR
     (B) THE FAILURE OF ADMINISTRATIVE AGENT TO HONOR A DRAFT UNDER SUCH LC AS A
     RESULT OF ANY ACT OR OMISSION, WHETHER RIGHTFUL OR WRONGFUL, OF ANY PRESENT
     OR FUTURE GOVERNMENTAL AUTHORITY; PROVIDED THAT BORROWER SHALL HAVE NO
     LIABILITY TO INDEMNIFY ANY CREDIT PARTY IN RESPECT OF ANY LIABILITY ARISING
     OUT OF THE GROSS NEGLIGENCE OR WILFUL MISCONDUCT OF SUCH PARTY OR ANY
     REPRESENTATIVES OF SUCH PARTY.  THE PROVISIONS OF AND UNDERTAKINGS AND
     INDEMNIFICATIONS SET FORTH IN THIS SECTION 2.2(i) SHALL SURVIVE THE
     SATISFACTION AND PAYMENT OF THE OBLIGATION AND TERMINATION OF THIS
     AGREEMENT.

           (j)   LC AGREEMENTS.  Although referenced in any LC, terms of any
     particular agreement or other obligation to the beneficiary are not in any
     manner incorporated herein.  Drafts under any LC shall be deemed part of
     the Obligation.  In the event of any conflict or inconsistency between the
     terms of this Agreement and any LC Agreement, the terms of this Agreement
     shall be controlling.

     2.    AMENDMENT OF CREDIT AGREEMENT AND OTHER LOAN DOCUMENTS.

     (a)   All references in the Loan Documents to the Credit Agreement shall
henceforth include references to the Credit Agreement as modified and amended by
this Amendment, and as may, from time to time, be further modified, amended,
restated, extended, renewed, and/or increased.

     (b)   Any and all of the terms and provisions of the Loan Documents are
hereby amended and modified wherever necessary, even though not specifically
addressed herein, so as to conform to the amendments and modifications set forth
herein.

     3.    RATIFICATIONS.  Borrower (a) ratifies and confirms all provisions of
the Loan Documents as amended by this Amendment, (b) ratifies and confirms that
all guaranties, assurances, and Liens, if any, granted, conveyed, or assigned to
the Credit Parties under the Loan Documents are not released, reduced, or
otherwise adversely affected by this Amendment and continue to guarantee,
assure, and secure full payment and performance of the present and future
Obligation, and (c) agrees to perform such acts and duly authorize, execute,
acknowledge, deliver, file, and record such additional documents, and
certificates as the Credit Parties may reasonably request in order to create,
perfect, preserve, and protect those guaranties, assurances, and Liens.

     4.    REPRESENTATIONS.  Borrower represents and warrants to the Credit
Parties that as of the date of this Amendment: (a) this Amendment and the other
documents executed in connection therewith (collectively, the "AMENDMENT
DOCUMENTS") have been duly authorized, executed, and delivered by Borrower and
each of the other Obligors that are parties to the Amendment Documents; (b) no
action of, or filing with, any Governmental Authority is required to authorize,
or is otherwise required in connection with, the execution, delivery, and
performance by Borrower or any other Obligor of the Amendment Documents; 

                                       -6-

<PAGE>

(c) the Loan Documents, as amended by the Amendment Documents, are valid and 
binding upon Borrower and the other Obligors and are enforceable against 
Borrower and the other Obligors in accordance with their respective terms, 
except as limited by Debtor Relief Laws and general principles of equity; (d) 
the execution, delivery, and performance by Borrower and the other Obligors 
of the Amendment Documents do not require the consent of any other Person and 
do not and will not constitute a violation of any Governmental Requirement, 
order of any Governmental Authority, or material agreements to which Borrower 
or any other Obligor is a party thereto or by which Borrower or any other 
Obligor is bound; (e) all representations and warranties in the Loan 
Documents are true and correct in all material respects on and as of the date 
of this Amendment, except to the extent that (i) any of them speak to a 
different specific date, or (ii) the facts on which any of them were based 
have been changed by transactions contemplated or permitted by the Credit 
Agreement; and (f) both before and after giving effect to the Amendment 
Documents, no Potential Default or Default exists.

     5.    CONDITIONS.  This Amendment and the other Amendment Documents shall
not be effective unless and until:

     (a)   the Credit Parties shall have received the Amendment Documents, in
form and substance acceptable to Administrative Agent;

     (b)   the representations and warranties in this Amendment are true and
correct in all material respects on and as of the date of this Amendment, except
to the extent that (i) any of them speak to a different specific date, or (ii)
the facts on which any of them were based have been changed by transactions
contemplated or permitted by the Credit Agreement; and

     (c)   both before and after giving effect to this Amendment, no Potential
Default or Default exists.

     6.    CONTINUED EFFECT.  Except to the extent amended hereby or by any
documents executed in connection herewith, all terms, provisions, and conditions
of the Credit Agreement and the other Loan Documents, and all documents executed
in connection therewith, shall continue in full force and effect and shall
remain enforceable and binding in accordance with their respective terms.

     7.    MISCELLANEOUS.  Unless stated otherwise (a) the singular number
includes the plural and VICE VERSA and words of any gender include each other
gender, in each case, as appropriate, (b) headings and captions may not be
construed in interpreting provisions, (c) this Amendment shall be construed --
and its performance enforced -- under Texas law, (d) if any part of this
Amendment is for any reason found to be unenforceable, all other portions of it
nevertheless remain enforceable, and (e) this Amendment may be executed in any
number of counterparts with the same effect as if all signatories had signed the
same document, and all of those counterparts must be construed together to
constitute the same document.
     8.    PARTIES.  This Amendment binds and inures to Borrower and the Credit
Parties and their respective successors and permitted assigns.

     9.    ENTIRETIES.  THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS
AMENDED BY THIS AMENDMENT AND THE OTHER AMENDMENT DOCUMENTS, REPRESENT THE FINAL
AGREEMENT BETWEEN THE PARTIES ABOUT THE SUBJECT MATTER OF THE CREDIT AGREEMENT
AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN
THE PARTIES.


                                       -7-

<PAGE>




                     [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK;
                             SIGNATURE PAGES TO FOLLOW.]



                                       -8-

<PAGE>




                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN

     EXECUTED as of the day and year first above written.

                             PROTECTION ONE ALARM MONITORING INC., a Delaware
                             corporation, as Borrower


                             By:  /s/ John E. Mackett
                                  -------------------------------------------
                                  Name:  John E. Mackett
                                        -------------------------------------
                                  Title: Executive Vice President
                                         ------------------------------------



<PAGE>




                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             NATIONSBANK, N.A.,
                             as Administrative Agent and a Lender


                             By: /s/ Curtis E. Anderson
                                  -------------------------------------------
                                  Name: Curtis E. Anderson
                                        -------------------------------------
                                  Title: Senior Vice President
                                         ------------------------------------


<PAGE>



                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             FIRST UNION NATIONAL BANK,
                             as Syndication Agent and a Lender


                             By: /s/ Michael J. Kolosowsky
                                ---------------------------------------
                              Name: Michael J. Kolosowsky
                                   ------------------------------------
                              Title: Vice President
                                   ------------------------------------


<PAGE>

                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             TORONTO DOMINION (TEXAS) INC.,
                             as Documentation Agent and a Lender


                             By: /s/ Sonja R. Jordan
                                ---------------------------------------
                              Name: Sonja R. Jordan
                                   ------------------------------------
                              Title: Vice President
                                   ------------------------------------

<PAGE>

                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             MORGAN STANLEY SENIOR FUNDING, INC.,
                             as a Lender


                           By: /s/ Michael Hart
                              -----------------------------------------
                              Name: Michael Hart
                                   ------------------------------------
                              Title: Principal
                                   ------------------------------------

<PAGE>

                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             CHASE MANHATTAN BANK,
                             as a Lender


                           By: /s/ Paul V. Farrell
                              -----------------------------------------
                              Name: Paul V. Farrell
                                   ------------------------------------
                              Title: Vice President
                                   ------------------------------------

<PAGE>

                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             WESTDEUTSCHE LANDESBANK GIROZENTRALE,
                             NEW YORK BRANCH,
                             as a Lender


                            By: /s/ Walter T. Puffy III
                               -----------------------------------------
                               Name: Walter T. Puffy III
                                    ------------------------------------
                               Title: Associate
                                    ------------------------------------


                            By: /s/ Lisa Walker
                               -----------------------------------------
                               Name: Lisa Walker
                                    ------------------------------------
                               Title: Vice President
                                    ------------------------------------

<PAGE>

                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             THE FIRST NATIONAL BANK OF CHICAGO,
                             as a Lender


                           By: /s/ Madeleine N. Pember
                              -----------------------------------------
                              Name: Madeleine N. Pember
                                   ------------------------------------
                              Title: Assistant Vice President
                                   ------------------------------------

<PAGE>


                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             UBS AG, STAMFORD BRANCH,
                             as a Lender


                             By: /s/ Paul R. Morrison
                                -----------------------------------------
                                Name: Paul R. Morrison
                                     ------------------------------------
                                Title: Director
                                     ------------------------------------


                             By: /s/ Andrew N. Taylor
                                -----------------------------------------
                                Name: Andrew N. Taylor
                                     ------------------------------------
                                Title: Associate Director
                                     ------------------------------------

<PAGE>

                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             MERITA BANK PLC,
                             as a Lender


                           By: /s/ Charles L. Lansdown
                              -----------------------------------------
                              Name: Charles L. Lansdown
                                   ------------------------------------
                              Title: Vice President
                                   ------------------------------------


                           By: /s/ Andrew J. Ragusa
                              -----------------------------------------
                              Name:  Andrew J. Ragusa
                                   ------------------------------------
                              Title: Assistant Vice President
                                   ------------------------------------


<PAGE>

                        SIGNATURE PAGE TO FIRST AMENDMENT OF
                                CREDIT AGREEMENT AMONG
                 PROTECTION ONE ALARM MONITORING, INC., AS BORROWER,
                     NATIONSBANK, N.A., AS ADMINISTRATIVE AGENT,
                        THE SYNDICATION AGENT DEFINED THEREIN,
                       THE DOCUMENTATION AGENT DEFINED THEREIN,
                                         AND
                               THE LENDERS NAMED HEREIN


                             GUARANTY FEDERAL BANK, F.S.B.,
                             as a Lender


                           By: /s/ Robert S. Hays
                              -----------------------------------------
                              Name: Robert S. Hays
                                   ------------------------------------
                              Title: Vice President
                                   ------------------------------------

<PAGE>

     To induce the Credit Parties to enter into this Amendment, each of the 
undersigned (a) consents and agrees to the Amendment Documents' execution and 
delivery, (b) ratifies and confirms that all guaranties, assurances, and 
Liens, if any, granted, conveyed, or assigned to the Credit Parties under the 
Loan Documents are not released, diminished, impaired, reduced, or otherwise 
adversely affected by the Amendment Documents and continue to guarantee, 
assure, and secure the full payment and performance of all present and future 
Obligation (except to the extent specifically limited by the terms of such 
guaranties, assurances, or Liens), (c) agrees to perform such acts and duly 
authorize, execute, acknowledge, deliver, file, and record such additional 
guaranties, assignments, security agreements, deeds of trust, mortgages, and 
other agreements, documents, instruments, and certificates as the Credit 
Parties may reasonably deem necessary or appropriate in order to create, 
perfect, preserve, and protect those guaranties, assurances, and Liens, and 
(d) waives notice of acceptance of this consent and agreement, which consent 
and agreement binds the undersigned and its successors and permitted assigns 
and inures to the Credit Parties and their respective successors and 
permitted assigns.

                                 PROTECTION ONE, INC., a Delaware corporation


                                 By: /s/ John E. Mack III
                                     -----------------------------------------
                                     Name: John E. Mack III
                                          ------------------------------------
                                     Title: Executive Vice President
                                          ------------------------------------


                                  COMSEC/NARRAGANSETT SECURITY, INC., a
                                  Delaware corporation


                                 By: /s/ John E. Mack III
                                     -----------------------------------------
                                     Name: John E. Mack III
                                          ------------------------------------
                                     Title: Vice President
                                          ------------------------------------

                                   NETWORK MULTI-FAMILY SECURITY CORPORATION, a
                                   Delaware corporation


                                 By: /s/ John E. Mack III
                                     -----------------------------------------
                                     Name: John E. Mack III
                                          ------------------------------------
                                     Title: Vice President
                                          ------------------------------------

<PAGE>

                                 PROTECTION ONE INTERNATIONAL, INC., a
                                 Delaware corporation


                                 By: /s/ John E. Mack III
                                     -----------------------------------------
                                     Name: John E. Mack III
                                          ------------------------------------
                                     Title: President
                                          ------------------------------------


                                 PROTECTION ONE INVESTMENTS, INC., a Delaware
                                 corporation


                                 By: /s/ John E. Mack III
                                     -----------------------------------------
                                     Name: John E. Mack III
                                          ------------------------------------
                                     Title: President
                                          ------------------------------------


                                 DSC ENTERPRISES, INC., a Maryland corporation


                                 By: /s/ John E. Mack III
                                     -----------------------------------------
                                     Name: John E. Mack III
                                          ------------------------------------
                                     Title: President
                                          ------------------------------------