2ARMW-BA503Bluetooth USB Adapter

Shenzhen Hongjiayi Electronics Co., Ltd. Date: June 26, 2023 Product Model Number: BA503, BA501, BA502, BA601, BA602, BA603, BT501, BT502, BT503, BT504 FCC ID: 2ARMW-BA503 To whom it may concern, Re: Product Certification Representative Authorization Letter We authorize QAI Laboratories Ltd. 3980 North Fraser Way, Burnaby B.C. Canada V5J 5K5 to act on our behalf on all matters concerning the above named equipment. This shall include the following: • Testing • Approval applications and procedures We declare that ORGANIZATION. is allowed to forward all information related to the approval project to the applied certification body and to the notification entities and to discuss any issues concerning the approval application. Any and all acts carried out by ORGANIZATION. on our behalf shall have the same effect as acts of our own. By: Steven Wu Contact Listed on FCC Wesbite Title: Manager Email: [email protected] Telephone: 0755-29643778 On behalf of: Shenzhen Hongjiayi Electronics Co., Ltd.

Shenzhen Hongjiayi Electronics Co., Ltd. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: June 26, 2023 FCC ID: 2ARMW-BA503 Ref. #1: Attestation Statements Part 2.911(d)(5)(i) Filing Shenzhen Hongjiayi Electronics Co., Ltd. certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Ref. #2: Attestation Statements Part 2.911(d)(5)(ii) Filing Shenzhen Hongjiayi Electronics Co., Ltd. certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Applicant: Shenzhen Hongjiayi Electronics Co., Ltd. Address: 3rd Flr, Blg B, Shajing West Industrial Park, Bao'an District, Shenzhen, 518000 China Contact Person: Steven Wu Tel.: 0755-29643778 Email: [email protected] Sincerely, Signature:

Shenzhen Hongjiayi Electronics Co., Ltd. U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: 06-26-2023 Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2ARMW-BA503 Shenzhen Hongjiayi Electronics Co., Ltd. (“the applicant”) certifies that, as of the date of the filing of the application, CLF Import and Export Limited (“the agent”) is our designated U.S. agent for service of process for the above reference FCC ID. The applicant accepts to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. The applicant further acknowledges it is our responsibility to inform the FCC whenever the agent information changes. CLF Import and Export Limited ("the agent) understand it is the agent's obligation to accept service of process in the United States for matters related to the applicable equipment, and at the physical U.S. address and email address. Designated U.S. Agent Company Name: CLF Import and Export Limited FRN: 0033489683 Address: 1312 17th Street #692, Denver, CO 80202, United States Signature: Contact Person: David Chen Tel: +1 949 254 2565 Email: [email protected] Applicant Company Name: Shenzhen Hongjiayi Electronics Co., Ltd. Address: 3rd Flr, Blg B, Shajing West Industrial Park, Bao'an District, Shenzhen, 518000 China Signature: Contact Person: Steven Wu Tel: 0755-29643778 Email: [email protected]

Shenzhen Hongjiayi Electronics Co., Ltd. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: June 26, 2023 Subject; Request for Confidentiality FCC ID: 2ARMW-BA503 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure Software Security Requirements for UNII devices In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Steven Wu Title: Manager

Shenzhen Hongjiayi Electronics Co., Ltd. Model Difference Statement Dear Sir/Madam, Added models BA501, BA502, BA601, BA602, BA603, BT501, BT502, BT503, BT504 basis of the original product BA503. The color of appearance and model name of series models listed are different from the main model, but the circuit and the electronic construction are the same, declared by the manufacturer. Sincerely, Name: Steven Wu Title: Manager Company name: Shenzhen Hongjiayi Electronics Co., Ltd. Address: 3rd Flr, Blg B, Shajing West Industrial Park, Bao'an District, Shenzhen, 518000 China

FCC ID: 2ARMW-BA503 EUT PHOTO(External Photos)

Page 1 of 1 Label and Information FCC Label Sample FCC Label Specifications Text is Black in color and is justified. Labels are printed in indelible ink on permanent adhesive backing or silk-screened onto the EUT or shall be affixed at a conspicuous location on the EUT. Where the EUT is constructed in two or more sections connected by wires and marketed together, the above statement is required to be affixed only to the main control unit. When the EUT is so small or for such use that it is not practicable to place the statement on it, the above information shall be placed in a prominent location in the instruction manual or pamphlet supplied to the user or, alternatively, shall be placed on the container in which the device is marketed. FCC Label Location

FCC ID: 2ARMW-BA503 EUT PHOTO(Internal Photos) BT ANT

FCC ID: 2ARMW-BA503 RF Exposure Evaluation According to KDB 447498 D01 General RF Exposure Guidance v06 and part 2.1093， Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f (GHz) ] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR, where f (GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation The result is rounded to one decimal place for comparison Here, The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. For BLE Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 0.93 0(±1) 1 1.259 2402 5 0.390249 3.0 For BR+EDR Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 3.11 3(±1) 4 2.512 2402 5 0.778639 3.0 So a SAR test is not required

Project No.: ZKT-230621L4678E-2 Page 1 of 42 FCC TEST REPORT FCC ID: 2ARMW-BA503 Report Number. .............................. : ZKT-230621L4678E-2 Date of Test .................................................:June 12, 2023 to June 25, 2023 Date of issue .................................... : June 26, 2023 Total number of pages ...................... 42 Test Result ..................................... : PASS Testing Laboratory. ........................ : Shenzhen ZKT Technology Co., Ltd. Address .......................................... : 1/F, No. 101, Building B, No. 6, Tangwei Community Industrial Avenue, Fuhai Street, Bao'an District, Shenzhen, China Applicant's name ......................... : Shenzhen Hongjiayi Electronics Co., Ltd. Address .......................................... : 3rd Flr, Blg B, Shajing West Industrial Park, Bao'an District, Shenzhen, 518000 China Manufacturer's name ................... : Shenzhen Hongjiayi Electronics Co., Ltd. Address .......................................... : 3rd Flr, Blg B, Shajing West Industrial Park, Bao'an District, Shenzhen, 518000 China Test specification: Standard .......................................... : FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2013 Test procedure ................................. : / Non-standard test method ............. : N/A Test Report Form No. .................... : TRF-EL-111_V0 Test Report Form(s) Originator .... : ZKT Testing Master TRF .................................... : Dated: 2020-01-06 This device described above has been tested by ZKT, and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of ZKT, this document may be altered or revised by ZKT, personal only, and shall be noted in the revision of the document. Product name ................................. : Bluetooth USB Adapter Trademark ...................................... : N/A Model/Type reference......................: BA503, BA501, BA502, BA601, BA602, BA603, BT501, BT502, BT503, BT504 Ratings ............................................. : DC 5V by USB Testing procedure and testi ng location: Testing Laboratory ..................................... :Shenzhen ZKT Technology Co., Ltd. Address ...................................................... :1/F, No. 101, Building B, No. 6, Tangwei Community Industrial Avenue, Fuhai Street, Bao'an District, Shenzhen, China Jim Liu Tested by (name + signature) .................... : Jackson Fang Reviewer (name + signature) ..................... : Lake Xie Approved (name + signature) .................... : Project No.: ZKT-230621L4678E-2 Page 2 o f 42 Project No.: ZKT-230621L4678E-2 Page 3 of 42 Table of Contents Page 1.VERSION 5 2. SUMMARY OF TEST RESULTS 6 2.1 TEST FACILITY 7 2.2 MEASUREMENT UNCERTAINTY 7 3. GENERAL INFORMATION 8 3.1 GENERAL DESCRIPTION OF EUT 8 3.2 DESCRIPTION OF TEST MODES 10 3.3 BLOCK DIGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED 10 3.4 DESCRIPTION OF SUPPORT UNITS(CONDUCTED MODE) 10 3.5 EQUIPMENTS LIST FOR ALL TEST ITEMS 11 4. EMC EMISSION TEST 13 4.1 CONDUCTED EMISSION MEASUREMENT 13 4.1.1 POWER LINE CONDUCTED EMISSION LIMITS 13 4.1.2 TEST PROCEDURE 13 4.1.3 DEVIATION FROM TEST STANDARD 13 4.1.4 TEST SETUP 14 4.1.5 EUT OPERATING CONDITIONS 14 4.2.1 RADIATED EMISSION LIMITS 17 4.2.2 TEST PROCEDURE 18 4.2.3 DEVIATION FROM TEST STANDARD 18 4.2.4 TEST SETUP 18 4.2.5 EUT OPERATING CONDITIONS 19 5.RADIATED BAND EMISSION MEASUREMENT 24 5.1 TEST REQUIREMENT: 24 5.2 TEST PROCEDURE 24 5.3 DEVIATION FROM TEST STANDARD 24 5.4 TEST SETUP 25 5.5 EUT OPERATING CONDITIONS 25 5.6 TEST RESULT 26 6.POWER SPECTRAL DENSITY TEST 27 6.1 APPLIED PROCEDURES / LIMIT 27 6.2 TEST PROCEDURE 27 6.3 DEVIATION FROM STANDARD 27 6.4 TEST SETUP 27 6.5 EUT OPERATION CONDITIONS 27 6.6 TEST RESULT 28 Project No.: ZKT-230621L4678E-2 Page 4 of 42 Table of Contents Page 7. CHANNEL BANDWIDTH 30 7.1 APPLIED PROCEDURES / LIMIT 30 7.2 TEST PROCEDURE 30 7.3 DEVIATION FROM STANDARD 30 7.4 TEST SETUP 30 7.5 EUT OPERATION CONDITIONS 30 7.6 TEST RESULT 31 8.PEAK OUTPUT POWER TEST 35 8.1 APPLIED PROCEDURES / LIMIT 35 8.2 TEST PROCEDURE 35 8.3 DEVIATION FROM STANDARD 35 8.4 TEST SETUP 35 8.5 EUT OPERATION CONDITIONS 35 8.6 TEST RESULT 36 9. CONDUCTED BAND EDGE AND SPURIOUS EMISSION 38 9.1 APPLICABLE STANDARD 38 9.2 TEST PROCEDURE 38 9.3 DEVIATION FROM STANDARD 38 9.4 TEST SETUP 38 9.5 EUT OPERATION CONDITIONS 38 10.ANTENNA REQUIREMENT 41 11. TEST SETUP PHOTO 42 12. EUT CONSTRUCTIONAL DETAILS 42 Project No.: ZKT-230621L4678E-2 Page 5 of 42 1.VERSION Report No. Version Description Approved ZKT-230621L4678E-2 Rev.01 Initial issue of report June 26, 2023 Project No.: ZKT-230621L4678E-2 Page 6 of 42 2. SUMMARY OF TEST RESULTS Test procedures according to the technical standards: FCC Part15 (15.247) , Subpart C Standard Section Test Item Judgment Remark FCC part 15.203/15.247 (c) Antenna requirement PASS FCC part 15.207 AC Power Line Conducted Emission PASS FCC part 15.247 (b)(3) Conducted Peak Output Power PASS FCC part 15.247 (a)(2) Channel Bandwidth& 99% OCB PASS FCC part 15.247 (e) Power Spectral Density PASS FCC part 15.247(d) Band Edge PASS FCC part 15.205/15.209 Spurious Emission PASS NOTE: (1)“N/A” denotes test is not applicable in this Test Report Project No.: ZKT-230621L4678E-2 Page 7 of 42 2.1 TEST FACILITY Shenzhen ZKT Technology Co., Ltd. Add. : 1/F, No. 101, Building B, No. 6, Tangwei Community Industrial Avenue, Fuhai Street, Bao'an District, Shenzhen, China FCC Test Firm Registration Number: 692225 Designation Number: CN1299 IC Registered No.: 27033 2.2 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ± U，where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2，providing a level of confidence of approximately 95 %。 No. Item Un…

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EUT TEST PHOTO FCC ID: 2ARMW-BA503 Radiated band emission (30MHz-1GHz): Conducted emission: Radiated band emission (Above 1GHz):