UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   -----------

                                   FORM 10-K/A

[X]                ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                   OF THE SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1999

[  ]               TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d)
                   OF THE SECURITIES EXCHANGE ACT OF 1934

                            For the transition period from              to

           0-24780                            33-73002-01
   (Commission File Number)             (Commission File Number)
     Protection One, Inc.          Protection One Alarm Monitoring, Inc.
(Exact Name of Registrant as           Exact Name of Registrant as
   Specified in Charter)                 Specified in Charter)

         Delaware                               Delaware
(State of Other Jurisdiction           (State or Other Jurisdiction
 of Incorporation or Organization)       of Incorporation or Organization)

        93-1063818                             93-1064579
(I.R.S. Employer Identification No.)   (I.R.S. Employer Identification No.)

6011 Bristol Parkway, Culver City,      6011 Bristol Parkway, Culver City,
  California, 90230                        California, 90230
(Address of Principal Executive Offices, (Address of Principal Executive
 Including Zip Code)                        Offices, Including Zip Code)

    (310) 342-6300                               (310) 342-6300
(Registrant's Telephone Number,          (Registrant's Telephone Number,
 Including Area Code)                      Including Area Code)

                            -----------

      Securities  registered  pursuant to Section 12(b) of the Act:

       Title of Each Class             Name of Each Exchange On Which Registered
Common Stock, par value $.01 per share,          New York Stock Exchange
of Protection One, Inc. 6 3/4% Convertible
Senior Subordinated Notes Due 2003 of
Protection One Alarm Monitoring, Inc.,
Guaranteed by Protection One, Inc.

      Securities  registered  pursuant to Section 12(g) of the Act:

                                     (None)
                                (Title of Class)

         Indicate by check mark  whether each of the  registrants  (1) has filed
all  reports  required  to be filed  by  Section  13 or 15(d) of the  Securities
Exchange Act of 1934 during the preceding 12 months (or for such shorter  period
that such registrant was required to file such reports) and (2) has been subject
to such filing requirements for the past 90 days. Yes [X] No [ ]

         Indicate by check mark if disclosure  of delinquent  filers  pursuant
to Item 405 of Regulation  S-K is not contained  herein, and will not be
contained,  to the best of each registrant's  knowledge,  in definitive proxy
or information statements incorporated by reference in Part III of this
Form 10-K or any amendment to this Form 10-K. [X]

         The aggregate market value of common stock of Protection One, Inc. held
by  nonaffiliates on March 24, 2000 (based on the last sale price of such shares
on the New York Stock Exchange) was $32,213,180.

         As of March 24, 2000,  Protection One, Inc. had  126,945,337  shares of
Common Stock outstanding, par value $0.01 per share. As of such date, Protection
One Alarm Monitoring, Inc. had outstanding 110 shares of Common Stock, par value
$0.10  per  share,  all of which  shares  were  owned by  Protection  One,  Inc.
Protection One Alarm Monitoring,  Inc. meets the conditions set forth in General
Instructions  I (1)(a) and (b) for Form 10-K and is  therefore  filing this form
with the reduced disclosure format set forth therein.

DOCUMENTS INCORPORATED BY REFERENCE:

         Portions of Protection  One,  Inc.'s proxy statement on Schedule 14A to
be  furnished  to   stockholders  in  connection  with  its  Annual  Meeting  of
Stockholders  are  incorporated  by reference in Part III of the Form 10-K. Such
proxy  statement is expected to be filed with the Commission  prior to April 29,
2000.


<PAGE>


          This amendment to the 1999 Form 10K as originally filed is made solely
to correct this signature page.

                                   SIGNATURES

         Pursuant to the  requirements  of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrants  have duly caused this report to be signed
on their behalf by the undersigned, thereunto duly authorized.

                                          PROTECTION ONE, INC.
                                          PROTECTION ONE ALARM MONITORING, INC.

                March 28, 2000            By:          TONY SOMMA
                                              --------------------------------
                                               Tony  Somma
                                               Chief   Financial   Officer,
                                               Secretary and Treasurer

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
this  report has been  signed  below by the  following  persons on behalf of the
registrants and in the capacities and on the dates indicated.

       Signature                    Title                       Date

                           Chief Executive Officer
    JOHN E. MACK III      (Principal Executive Officer)     March 28, 2000
---------------------------
    John E. Mack III
                            Chief Financial Officer,
                           Secretary and Treasurer          March 28, 2000
    TONY SOMMA             (Principal Financial and
---------------------------  Accounting Officer)
    Tony Somma

                                  Director                  March 28, 2000
    ANNETTE BECK
--------------------------
    Annette M. Beck

                                  Director                  March 28, 2000
    HOWARD A. CHRISTENSEN
---------------------------
    Howard A. Christensen

                                  Director                  March 28, 2000
    JOHN B. DICUS
---------------------------
    John B. Dicus

                                  Director                  March 28, 2000
    MARIA DE LOURDES DUKE
---------------------------
    Maria de Lourdes Duke

                                  Director                   March 28, 2000
    BEN M. ENIS
---------------------------
    Ben M. Enis

                                  Director                   March 28, 2000
    DONALD A. JOHNSTON
---------------------------
    Donald A. Johnston

                                  Director                   March 28, 2000
    DOUGLAS T. LAKE
--------------------------
    Douglas T. Lake

                                  Director                   March 28, 2000
    CARL M. KOUPAL, JR.
----------------------------
    Carl M. Koupal, Jr.

                                  Director                   March 28, 2000
    JOHN H. ROBINSON
----------------------------
    John H. Robinson

                                  Director                   March 28, 2000
    JAMES Q. WILSON
----------------------------
    James Q. Wilson