Document:

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                                                                    Exhibit 10.4

                                PARENT AGREEMENT
                                ----------------

         THIS PARENT AGREEMENT ("Agreement") dated as of November 1, 2001 is
executed and delivered by ARCHSTONE-SMITH TRUST, a Maryland real estate
investment trust ("Parent"), in favor of (a) THE CHASE MANHATTAN BANK, in its
capacity as Agent (the "Agent") for the Lenders under that certain Credit
Agreement dated as of December 20, 2000 by and among ARCHSTONE COMMUNITIES
TRUST, now known as ARCHSTONE-SMITH OPERATING TRUST (the "Borrower"), the
financial institutions party thereto and their assignees in accordance therewith
(the "Lenders"), and the Agent (as the same has been amended by an amendment
dated September 21, 2001 and an amendment dated of even date herewith, and as
the same may be further amended, restated, supplemented or otherwise modified
from time to time in accordance with its terms, the "Credit Agreement") and (b)
the Lenders.

         WHEREAS, pursuant to the Credit Agreement, the Lenders have made
available to the Borrower certain financial accommodations on the terms and
conditions set forth in the Credit Agreement;

         WHEREAS, the Borrower is a Subsidiary of the Parent; and

         WHEREAS, the Borrower and the Parent have determined it to be in their
mutual best interests to obtain financing for the Borrower from the Agent and
the Lenders through their collective efforts.

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged by the Parent, the Parent agrees as
follows:

         Section 1. Receipt, Certificate. The Parent acknowledges that it has
                    --------------------
received a copy of the Credit Agreement. The capitalized terms used in this
Agreement and not otherwise defined herein shall have the respective meanings
ascribed to them in the Credit Agreement. The Parent agrees to provide the
Officer's Certificate referenced in Section 6 of the Agreement and First
Amendment to Credit Agreement dated as of September 21, 2001.

         Section 2. Legal Requirements. The Parent will comply with all Legal
                    ------------------
Requirements to maintain, and will at all times elect, qualify as and maintain,
its status as a real estate investment trust under Section 856(c)(1) of the
Code.

         Section 3. Legal Compliance. The Parent will (a) maintain at least one
                    ----------------
class of common shares of the Parent having trading privileges on the New York
Stock Exchange or the American Stock Exchange, or which is listed on The NASDAQ
Stock Market's National Market; (b) own, directly or indirectly, at least
fifty-one percent (51%) of (i) the shares of beneficial interest of the
Borrower, and (ii) the Class A-2 Common Units of the Borrower and any other
class of security

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issued by the Borrower with the power to elect the Trustees of the Borrower; (c)
maintain management and control of the Borrower; and (d) not sell, transfer or
convey any of the shares of beneficial interest of the Borrower owned by the
Parent, except (i) in payment of the purchase price of Property (including
mergers with and acquisitions of Persons) acquired by the Borrower. (ii) upon
conversion or redemption of securities of the Borrower in accordance with their
terms or (iii) upon any repurchase by the Borrower of the Borrower's securities
from the Parent in connection with a repurchase by the Parent of the Parent's
securities.

         Section 4. Negative Covenants. The Parent will not (a) have any
                    ------------------
Subsidiary that is a "qualified REIT subsidiary" under Section 856 of the Code
other than the QRS Entities; (b) own any Property other than the ownership
interests of the Borrower, and the Parent's ownership interests as of the date
of the Merger in the QRS Entities; (c) give or allow any Lien on any of its
Property including the ownership interests of the Borrower; and (d) create,
incur, suffer or permit to exist, or assume or guarantee, directly or
indirectly, contingently or otherwise, or become or remain liable with respect
to (i) any Indebtedness if the aggregate of such Indebtedness and the
Indebtedness of the Borrower would violate Sections 5.3(a), (b), (c) or (e) if
                                                    ------  ---  ---    ---
such aggregate Indebtedness is treated as the Borrower's Indebtedness, and (ii)
any Indebtedness of a Person other than the Parent.

         Section 5. Conduct of Business. The Parent will hold all of its assets
                    -------------------
and conduct all of its operations through the Borrower, the QRS Entities that
are in existence on the date hereof and one or more of the Borrower's
Subsidiaries.

         Section 6.  Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY, AND
                     -------------
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS.

         Section 7.  JURISDICTION, VENUE.
                     -------------------

         (a) THE FEDERAL DISTRICT COURT OF THE SOUTHERN DISTRICT OF TEXAS,
HOUSTON DIVISION, OR, AT THE OPTION OF THE AGENT, ANY STATE COURT LOCATED IN
HARRIS COUNTY, TEXAS SHALL HAVE NON-EXCLUSIVE JURISDICTION TO HEAR AND DETERMINE
ANY CLAIMS OR DISPUTES BETWEEN OR AMONG THE PARENT, THE AGENT OR ANY OF THE
LENDERS, PERTAINING DIRECTLY OR INDIRECTLY TO THIS AGREEMENT OR ANY OTHER CREDIT
DOCUMENT OR TO ANY MATTER ARISING HEREFROM OR THEREFROM. THE PARENT EXPRESSLY
SUBMITS AND CONSENTS IN ADVANCE TO SUCH JURISDICTION IN ANY ACTION OR PROCEEDING
COMMENCED IN SUCH COURTS. THE CHOICE OF FORUM SET FORTH IN THIS SECTION SHALL
NOT BE DEEMED TO PRECLUDE THE BRINGING OF ANY ACTION BY THE AGENT OR ANY LENDER
OR THE ENFORCEMENT BY THE AGENT OR ANY LENDER IN ANY OTHER APPROPRIATE
JURISDICTION. FURTHER, THE PARENT IRREVOCABLY WAIVES, TO THE FULLEST EXTENT
PERMITTED BY APPLICABLE LAW, ANY OBJECTION WHICH

                                       2

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IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF THE VENUE OF ANY SUCH PROCEEDING
BROUGHT IN SUCH A COURT AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN SUCH A
COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.

         (b) THE FOREGOING WAIVERS HAVE BEEN MADE WITH THE ADVICE OF COUNSEL AND
WITH A FULL UNDERSTANDING OF THE LEGAL CONSEQUENCES THEREOF, AND SHALL SURVIVE
THE PAYMENT OF THE OBLIGATIONS AND THE TERMINATION OF THIS AGREEMENT.

         Section 8.   Waiver of Remedies. No delay or failure on the part of the
                      ------------------
Agent or the Lenders in the exercise of any right or remedy it may have against
the Parent hereunder or otherwise shall operate as a waiver thereof, and no
single or partial exercise by the Agent or the Lenders of any such right or
remedy shall preclude other or further exercise thereof or the exercise of any
other such right or remedy.

         Section 9.   Successors and Assigns. Each reference herein to the Agent
                      ------------------
or the Lenders shall be deemed to include such Person's respective successors
and assigns (including, but not limited to, any holder of the Obligations) in
whose favor the provisions of this Agreement also shall inure, and each
reference herein to the Parent shall be deemed to include the Parent's
successors and assigns, upon whom this Agreement also shall be binding. The
Lenders and the Agent may, in accordance with the applicable provisions of the
Credit Agreement, assign, transfer or sell any Obligation, or grant or sell
participation in any Obligations, to any Person or entity without the consent
of, or notice to, the Parent and without releasing, discharging or modifying the
Parent's obligations hereunder. The Parent may not assign or transfer its
obligations hereunder to any Person.

         Section 10.  Amendments.  This Agreement may not be amended except as
                      ----------
provided in the Credit Agreement.

         Section 11.  Notices.   All notices, requests and other communications
                      -------
hereunder shall be in writing and shall be given as provided in the Credit
Agreement.  The Parent's address for notice is set forth below its signature
hereto.

         Section 12. Severability. In case any provision of this Agreement shall
                     ------------
be invalid, illegal or unenforceable in any jurisdiction, the validity, legality
and enforceability of the remaining provisions shall not in any way be affected
or impaired thereby.

         Section 13.  Headings.  Section headings used in this Agreement are for
                      --------
convenience only and shall not affect the construction of this Agreement.

                                       3

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         IN WITNESS WHEREOF, the Parent has duly executed and delivered this
Agreement as of the date and year first written above.

                                   ARCHSTONE-SMITH TRUST

                                   By: /s/ Jack R. Callison, Jr.
                                      ------------------------------------------
                                   Name:  Jack R. Callison, Jr.
                                        ----------------------------------------
                                   Title:  Vice President
                                         ---------------------------------------

                                   Address for Notices:

                                   Archstone-Smith Trust
                                   7670 S. Chester Street, Suite 100
                                   Englewood, Colorado 80112
                                   Attention:  Charles E. Mueller, Jr.

                                       4<PAGE>

                                                                    Exhibit 10.2
                           OEM Manufacturing Agreement

     THIS OEM MANUFACTURING AGREEMENT ("Agreement") is made and entered into as
                                        ---------
of September 11, 2001, by and between Shenzhen Hyt Science & Technology Company,
LTD., ("HYT"), and RELM Wireless Corporation, a Nevada corporation ("RELM").
        ---                                                          ----

                                    RECITALS
                                    --------

     RELM may desire from time to time during the term hereof to purchase
Products (as defined herein) from HYT and HYT may desire to sell Products to
RELM, upon the terms and conditions set forth herein below.

     NOW THEREFORE, for good and valuable consideration, the sufficiency and
receipt of which is hereby acknowledged, the parties agree as follows:

     1.   Definitions.  As used herein, the following capitalized terms shall
          -----------
have the following means:

          (a)  "Affiliate" of any Person means any other Person Controlling,
Controlled by or under common Control with such Person.

          (b)  "Control" and all derivations thereof means the ability to either
(i) vote, directly or indirectly, fifty (50%) percent or more of the voting
interests in any Person or (ii) direct the affairs of another, whether through
voting power, contract or otherwise.

          (c)  "Person" means any natural person, any governmental authority or
agency and any entity, including corporations, partnerships, joint ventures,
limited liability companies, joint stock companies, trusts, estates, companies
and associations, whether organized for profit or otherwise.

          (d)  "Product" shall mean the products described in Exhibit A, and any
                                                              ---------
additional products that the parties may agree to include under this Agreement
pursuant to Section 2.1(a).
            --------------

          (e) "Specifications" shall mean the design, performance, and features
of the respective Products as initially set forth on Exhibit A, and such other
                                                     ---------
or modified Specifications as may be agreed to by HYT and RELM from time to
time.

     2.   Product, Price and Ordering. RELM shall have the exclusive right to
          ---------------------------
acquire Products from HYT pursuant to the terms and conditions set forth in this
Agreement, and HYT shall not sell Products, or any derivations thereof, to any
other Person in the Americas (North, Central, and South).

          2.1. Product Models. The initial Product models available hereunder
are set forth on Exhibit A. Additional Product models may be agreed to by the
                 ---------
parties in writing by
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execution of a New Model Addendum, substantially in the form of Exhibit B. Hyt
                                                                ---------
hereby represents and warrants that the Products, and any additional Products,
do not and shall not infringe on the products or intellectual property of any
third party. Product documentation, including owners manuals and service
manuals, in forms acceptable to RELM, shall be delivered with the Products
ordered hereunder.

               2.2. Price. The price for the Product models is as specified on
Exhibit A, or as otherwise agreed to by HYT and RELM. Pricing for any additional
---------
Product models shall be specified on the New Model Addendum for that model, or
as otherwise agreed to by HYT and RELM. Except as set forth in Section 2.3,
available accessories and parts shall be offered to RELM at HYT's regular
wholesale prices for such accessories and parts. All transaction shall be valued
and executed in United States dollars.

               2.3. Ordering Procedure.  RELM shall order its desired quantities
of Products, accessories or spare parts/units to be provided by HYT under this
Agreement by means of purchase orders (the "Purchase Orders"). Purchase Orders
                                            ---------------
shall be in writing and specify the Product, accessories and/or spare parts, as
well as the applicable price, quantity, and requested delivery schedule. RELM
shall provide to HYT a twelve (12) month forecast of requirements for products.
A forecast will be considered firm within two months of the scheduled delivery
date. RELM agrees to issue purchase orders for firm forecast requirements.

               2.4. Spare parts shall be included with Purchase Orders at no
additional cost to RELM. The value of such spare parts will not exceed five (5%)
percent of the value of the Purchase Order, except for catastrophic failures as
provided in Section 7.1. Such spare parts will be specified by RELM on the
            -----------
purchase order.

          3.   Delivery, Title And Risk Of Loss
               --------------------------------

               3.1. HYT shall deliver the Products purchased hereunder FOB to
the location designated by RELM. HYT shall arrange the shipping method, shipping
carrier and insurance applicable to each shipment for delivery to a location
specified by RELM. Title to the Product and risk of loss or damage for the
Product shall pass from HYT to RELM upon delivery at the location designated by
RELM. HYT is responsible for importation and all duties and taxes. HYT shall
provide RELM with an estimated delivery and shipment schedule for each Purchase
Order.

               3.2. RELM may, within fourteen (14) days of receipt of any
ordered Product units at its ship-to destination, notify HYT in writing of
rejection of any Product units which do not comply with the Specifications. RELM
may return such rejected units to HYT at HYT's expense and risk.

          4.   Distributorship.  In addition to the right to acquire Products
               ---------------
hereunder, HYT hereby grants to RELM the exclusive right to sell the products
specified in EXHIBIT A throughout the territories of North America, Central
America, and South America. HYT will sell its products to RELM at the prices
specified in EXHIBIT A. RELM shall pay HYT for the

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products in accordance with the payment terms specified in section 5 of this
agreement. RELM may resell the products at such prices and on such terms as RELM
shall determine.

          5.   Payment.  Twenty (20%) percent of the purchase price for each
               -------
Purchase Order shall be paid by wire transfer to HYT upon issuance of the
Purchase Order by RELM and the remaining eighty (80%) percent of the purchase
price shall be paid by wire transfer to HYT upon acceptance of the Products
pursuant to Section 3.2.
            -----------

          6.   Quality Assurance.  HYT will perform such inspections and tests
               -----------------
of each Product unit at least comparable to the level of quality assurance that
HYT implements for other products.

          7.   Product Protection
               ------------------

               7.1. Catastrophic Failure. A catastrophic failure is a material
failure of a Product due to a single cause or any material, component or part
therefore in an amount exceeding ten percent (10%) of the total units shipped
under this Agreement. In case of catastrophic failure, HYT shall repair affected
units of Product at its expense. RELM shall inform HYT in writing of all
catastrophic failures.

               7.2. Indemnity. HYT shall be responsible for and agrees to
indemnify RELM and hold RELM harmless from and against all third party claims,
demands and causes of action (including claims relating to compliance with all
applicable labor laws of the jurisdiction in which the Product is manufactured)
for direct damages (including reasonable legal fees and expenses) for personal
injuries or damage to tangible property (other than Product) directly resulting
from the willful misconduct or negligent acts or omissions of HYT in the
manufacturing of the Product or from any and all claims that the Products
infringe on the products or intellectual property of any third party. RELM
agrees to notify HYT as soon as practical of any third party claim, demand or
cause of action for which RELM will request indemnification from HYT. RELM will
provide HYT with the information and assistance reasonably requested by HYT to
defend such claim, demand or cause of action.

          8.   Confidentiality.
               ---------------

               8.1. The information supplied by one party to the other under
this Agreement which is marked or otherwise designated in writing to be of a
proprietary or confidential nature ("Confidential Information") shall be kept
confidential by the receiving party for a period of two (2) years following
expiration of this Agreement. Except as otherwise specified in writing, the
receiving party shall: (a) treat and protect the terms and provisions of this
Agreement and all information, documentation, and know-how received as
Confidential Information; (b) not reproduce (except in a manner and purpose
consistent with the purpose of this Agreement) Confidential Information in whole
or in part; and, (c) use Confidential Information only in conjunction with its
performance hereunder or its use of the Products.

               8.2  Neither party shall forward or disclose any Confidential
Information of the other party to any third party without the prior written
consent of the other party, except that

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<PAGE>

nothing herein shall preclude a party from disclosing such information to any
Affiliate of such party with a need to know such information. Notwithstanding
the foregoing, neither party shall have any obligation with respect to any
information of the other party which: (a) was previously known by or is
independently and demonstrably developed at any time by the receiving party
without any connection with the information received; (b) at any time becomes a
matter of public knowledge or literature without any act or negligence by the
receiving party; or (b) is at any time lawfully received by the receiving party
from a third Person under circumstances permitting its disclosure to others.

               8.3  Each party shall take the same actions and utilize the same
precautions in preventing unauthorized disclosure of the other party's
Confidential Information as it uses with regard to its own Confidential
Information, which shall in no event be less than reasonable care.

               8.4  In the event of termination of this Agreement for any
reason, both parties shall return or destroy and certify to the other party the
return or destruction of all Confidential Information and reproductions thereof.
Notwithstanding the foregoing, RELM may retain certain confidential or
proprietary information for an agreed period of time for the sole purpose of
servicing the Product after which time RELM shall then return such information
to HYT.

          9.   Term and Termination.
               --------------------

               9.1  This Agreement shall be for a term commencing on the date of
this Agreement and ending five years thereafter, unless extended by the HYT and
RELM in writing.

               9.2  Either party may by written notice to the other party
terminate this Agreement with immediate effect if the other party has committed
a substantial and material breach of this Agreement and, after receipt of
written notice from the other party specifying the breach, the breach is not
rectified within a time period which shall be reasonable taking into account
previous technical and other relevant conditions; provided, however, that such
time period shall not be less than fifteen (15) days for corrective actions
involving the payment of money and thirty (30) days for all other purposes.

               9.3  The acceptance of any Purchase Order from, or the sale of
any Product to, RELM after the termination or expiration of this Agreement shall
not be construed as a renewal or extension thereof, nor as a waiver of
termination but, in the absence of a new fully executed written agreement, all
such transactions shall be governed by provisions identical with the provisions
of this Agreement.

          10.  Notices. Notices and other communications between the parties
               -------
shall be transmitted by facsimile or in writing to the other parties at the
addresses indicated below and shall be deemed effective upon confirmed receipt.
Either party may change its address by giving notice in writing thereof to the
other party.

               HYT:     Shenzhen Hyt Science & Technology Company, LTD.
                        At R2-A 1/F Shenzhen High-Tech Industrial Park
                        Shennan Road

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                        Shenzhen, China 518057
                        Attention: Chen Quing Zhou - President
                        Phone: 0755-6972-999
                        Fax: 0755-6970-899

               RELM:    RELM WIRELESS CORPORATION
                        at 7100 Technology Drive
                        West Melbourne, Florida 32904
                        Attention: President & Chief Executive Officer or
                                   Vice President & Chief Financial Officer
                        Phone: (321) 984-1414
                        Fax: (321) 984-0168

          11.  Partial Invalidity. The invalidity, in whole or part, of any
               ------------------
section or paragraph of these terms shall not affect the validity of the
remainder of such section or paragraph, or of these terms. Section headings are
inserted for convenience only and shall not be used in any way to define the
meaning of these terms.

          12.  Assignment.  Either party may assign its rights or obligations
               ----------
under this Agreement to any Affiliate of such party. Otherwise, neither party
shall transfer or assign its rights or obligations under this Agreement.

          13.  Party Relationship.  This Agreement does not create any agency,
               ------------------
joint venture or partnership between RELM and HYT. Neither party shall impose or
create any obligation or responsibility, express or implied, or make any
promises, representations or warranties on behalf of the other party or other
than as expressly provided herein.

          14.  Governing Law and Controversies.
               -------------------------------

               14.1  The validity, performances and all matters relating to the
          interpretation and effect of these terms and the Agreement and any
          amendment thereto shall be governed by the laws of the State of
          Florida without reference to its rules with respect to conflict of
          laws. The parties agree to the exclusive venue and jurisdiction of
          the state and federal courts located in Brevard County, Florida.

              14.2   If any controversies or disputes arise out of or relating
          to this Agreement, the parties shall first make efforts to resolve
          and settle the same through a good faith negotiation initiated within
          ten (10) days of receipt of written request for same by either party
          to the other. If no resolution of such controversy or dispute is
          reached within sixty (60) days of the original request (or by such
          other date as the parties may agree in writing), then either party may
          such controversy or dispute in binding arbitration.

              14.3   The parties irrevocably agree that all disputes arising
          out of or in connection with this Agreement shall be referred to final
          and binding arbitration, before a single arbitrator, under the
          commercial arbitration rules of the American Arbitration

                                      -5-
<PAGE>

          Association ("AAA") in Brevard County, Florida. The parties agree to
          use the "special expedited procedures" of the AAA. The arbitrator
          shall be selected by the parties, but if the parties are unable to
          reach agreement on selection of the arbitrator within seven (7) days
          after the date on which the notice of arbitration is sent to the
          parties to the arbitration, then the arbitrator will be selected in
          accordance with the rules of the American Arbitration Association.
          Judgment upon the award rendered by the arbitrator shall be final,
          binding and conclusive upon the parties and their respective
          administrators, executors, legal representatives, heirs, successors
          and permitted assigns, and may be entered in any court of competent
          jurisdiction. All questions as to the meaning of the provisions of
          this paragraph, or as to the ability to arbitrate any dispute under
          this paragraph shall be resolved by the arbitrators, shall be
          absolutely binding, and not subject to judicial review. The costs and
          expenses of arbitration shall be borne by the non-prevailing party.

          15.  Successors And Assigns.  The terms and provisions of this
               ----------------------
Agreement shall inure to the benefit and be binding upon the successors and
permitted assigns of either RELM or HYT.

          16.  Entire Agreement. This Agreement constitutes the entire
               ----------------
understanding between the RELM and the HYT concerning the subject matter hereof,
and any representation, promise, understanding, proposal, agreement, warranty,
course of dealing or trade usage not expressly contained or referenced herein
shall not be binding on HYT. No modifications, amendment, rescission, waiver or
other change shall be binding on either party unless accepted in writing by that
party.

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed by their duty authorized representatives as of the dates set
forth below.

Shenzhen HYT Science & Technology, LTD.     RELM Wireless Corporation

By:    /s/Chen Quing Zhou                   By:    /s/David P. Storey
    ---------------------------------           --------------------------------
Name: Chen Quing Zhou                       Name: David P. Storey

Title: President & Owner                    Title: President & CEO

Date: September 11, 2001                    Date: September 11, 2001

Witness: ____________________________       Witness: ___________________________

Witness Name: _______________________       Witness Name: ______________________

                                      -6-

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