2A4ZN-G-7872Lavalier microphone

FCC Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: •Reorient or relocate the receiving antenna. •Increase the separation between the equipment and receiver. •Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. •Consult the dealer or an experienced radio/TV technician for help. Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. RF Exposure Information The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Enping Huifeng Audio Equipment Factory Add: 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Date: 2022-3-1 FCC ID: 2A4ZN-G-7872 Dear Sir/Madam, We, Enping Huifeng Audio Equipment Factory Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, structure and internal of these model(s) are the same, Only model number is different for these model: Product name: Lavalier microphone Model no.: G-787, G-733, G-622, B-22, B-11, B-33, G-777, G-308, G-747, G-797, G-788, G-380, G-767, G-757, M-260, M-220, M-222, M-228, M-224,M-226, U-504, U-35, V-28, K-400, K-200, BM-550, G-900, G-800,G-100, G-200 Sincerely, Name/Title： Jiafeng Xu/Manager Company: Enping Huifeng Audio Equipment Factory Address: 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Phone: +86 13809602678 Fax: N/A E-Mail: [email protected]

CONFIDENTIALITY REQUEST for Certification Service in USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 Date:<2022-3-1> Pursuant to Paragraphs §0.457 and 0.459 of the Commission’s Rules (47 C.F.R.) and Section §552(b)(4) of the Freedom of Information Act, we requests confidentiality for the following products: FCC ID Model name 2A4ZN-G-7872 G-787 For the product stated above, we request that the following information be held confidential; Exhibits Long-Term Confidentiality Short-Term Confidentiality Short-Term Confidentiality Days External Photos Internal Photos Block Diagram Schematics Test Setup Photos User’s Manual Parts List Tune Up Operational Descriptions The long-term confidentiality exhibits contain our trade secrets and proprietary information that could be of benefit to our competitors. The short-term confidentiality on the basis of ensuring that business sensitive information remains confidential until the actual marketing of our new device. If you have any questions, please feel free to contact me at the address shown below. Sincerely, Name/Title： Jiafeng Xu/Manager Company: Enping Huifeng Audio Equipment Factory Address: 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Phone: +86 13809602678 Fax: N/A E-Mail: [email protected]

Enping Huifeng Audio Equipment Factory 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 2022-3-1 To whom it may concern: We, Enping Huifeng Audio Equipment Factory the undersigned, hereby authorize Eurofins Product Service GmbH to act on our behalf in all matters relating to applications for equipment authorization FCC ID: 2A4ZN-G-7872 including the signing of all documents related to these matters. Any and all acts carried out by Eurofins Product Service GmbH on our behalf shall have the same effect as acts of our own. We also hereby certify that no party to this application is subject to a denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. Sincerely, Name/Title： Jiafeng Xu/Manager Company: Enping Huifeng Audio Equipment Factory Address: 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Phone: +86 13809602678 Fax: N/A E-Mail: [email protected]

FCC ID: 2A4ZN-G-7872 External Photos of the EUT FCC ID: 2A4ZN-G-7872 FCC ID: 2A4ZN-G-7872 Antenna

FCC ID: 2A4ZN-G-7872 Label and Location Size: L: 2.0cm*W: 1.5cm Label and Location Lavalier microphone Model No.: G-787 FCC ID: 2A4ZN-G-7872

FCC ID: 2A4ZN-G-7872 Internal Photos of the EUT FCC ID: 2A4ZN-G-7872

RF Exposure evaluation FCC ID: 2A4ZN-G-7872 1.1. Applicable Standard According to §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to §1.1310 and §2.1093 RF exposure requirement KDB447498 v06: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies 1.2. Requirement According to KDB447498 D01 General RF Exposure Guidance v06 Section 4.3.1 Standalone SAR test exclusion considerations: “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, listed below, is satisfied. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions.22 The minimum test separation distance is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander (see 5) of section 4.1). To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, typically in the SAR measurement or SAR analysis report, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting is required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for the SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions; for example, handheld PTT two-way radios, handsets, laptops & tablets etc.23 “ [(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 • 3.0 and 7.5 are referred to as the numeric thresholds in the step 2 below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 5) in section 4.1 is applied to determine SAR test exclusion. 1.3. Manufacturing tolerance GFSK Channel Channel 1 Channel 9 Channel 17 Target (dBm) 8.0 8.0 8.0 Tolerance ±(dB) 1.0 1.0 1.0 2. E v a l u a t i o n R e s u l t Evaluation Results Band/Mode f (MHz) Antenna Distance (mm) RF output power (including tune-up tolerance) SAR Test Exclusion Threshold SAR Test Exclusion dBm mW GFSK 550.0 5 9.0 7.9433 1.1782 <3.0 Yes 3. C o n c l u s i o n The measurement results comply with the FCC Limit per 47 CFR 2.1093 for the uncontrolled RF Exposure and SAR Exclusion Threshold per KDB 447498 v06 .....................End of Report.........................

Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn FCC PART 15 SUBPART CTEST REPORT FCC PART 15.236 Report Reference No. ..................... : FCC ID. .............................................: CTA22021501101 2A4ZN-G-7872 Compiled by ( position+printedname+signature) ... : File administrators Kevin Liu Supervised by (position+printedname+signature) .... : Project Engineer Kevin Liu Approved by (position+printedname+signature) .... : RF Manager Eric Wang Date of issue ..................................... : Feb.26, 2022 Testing Laboratory Name .............: Shenzhen CTA Testing Technology Co., Ltd. Address ............................................ : Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao‘an District, Shenzhen, China Applicant’s name ............................ : ENPING HUIFENG AUDIO EQUIPMENT FACTORY Address ............................................ : 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Test specification ...........................: Standard ........................................... : FCC Part 15.236 Shenzhen CTA Testing Technology Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen CTA Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen CTA Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description .....................: Lavalier microphone Trade Mark ....................................... : GTD audio ® Manufacturer .................................... : ENPING HUIFENG AUDIO EQUIPMENT FACTORY Model/Type reference....................... : G-787 Listed Models .................................. : G-733, G-622, B-22, B-11, B-33, G-777, G-308, G-747, G-797, G- 788, G-380, G-767, G-757, M-260, M-220, M-222, M-228, M-224, M-226, U-504, U-35, V-28, K-400, K-200, BM-550, G-900, G-800, G-100, G-200 Modulation Type ............................... : GFSK Operation Frequency ........................ : 550-590MHz Rating ............................................... : DC 3.0V From Battery Result................................................ : PASS Report No.: CTA22021501101 Page 2 of 28 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn T E S T R E P O R T Equipment under Test : Lavalier microphone Model /Type : G-787 Listed Models : G-733, G-622, B-22, B-11, B-33, G-777, G-308, G-747, G-797, G-788, G-380, G-767, G-757, M-260, M-220, M-222, M-228, M-224, M-226, U-504, U-35, V-28, K-400, K-200, BM-550, G- 900, G-800, G-100, G-200 Model Declaration : PCB board, structure and internal of these model(s) are the same, So no additional models were tested. Applicant : ENPING HUIFENG AUDIO EQUIPMENT FACTORY Address : 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Manufacturer : ENPING HUIFENG AUDIO EQUIPMENT FACTORY Address : 4/F, No. 19 Zone A, Foreign and private industrial Zone, Enping City, Guangdong, China Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: CTA22021501101 Page 3 of 28 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Contents 1 T E S T S T A N D A R D S ................................................................. 4 2 S U M M A R Y ............................................................................ 5 2.1 General Remarks 5 2.2 Product Description 5 2.3 Test Sample 5 2.4 Equipment Under Test 5 2.5 Short description of the Equipment under Test (EUT) 6 2.6 EUT operation mode 6 2.7 Block Diagram of Test Setup 6 2.8 Related Submittal(s) / Grant (s) 6 2.9 Modifications 6 3 T E S T E N V I R O N M E N T .............................................................. 7 3.1 Address of the test laboratory 7 3.2 Test Facility 7 3.3 Environmental conditions 7 3.4 Summary of measurement results 7 3.5 Statement of the measurement uncertainty 8 3.6 Equipments Used during the Test 9 4 T E S T C O N D I T I O N S A N D R E S U L T S ........................................... 10 4.1 AC Power Conducted Emission 10 4.2 Maximum Output Power 11 4.3 Occupied Bandwidth 13 4.4 Necessary Bandwidth 15 4.5 Transmitter spurious emissions 19 4.6 Frequency Stability 21 5 T E S T S E T U P P H O T O S O F T H E E U T ......................................... 23 6 P H O T O S O F T H E E U T ........................................................... 24 Report No.: CTA22021501101 Page 4 of 28 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 1 T E S T S T A N D A R D S The tests were performed according to following standards: FCC Rules Part 15.236: Operation of wireless Lavalier microphones in the bands 54-72 MHz, 76-88 MHz, 174-216 MHz, 470-608 MHz and 614-698 MHz. ANSI C63.10-2013:AmericanNationalStandardforTestingUnlicensedWirelessDevices Report No.: CTA22021501…

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FCC ID: 2A4ZN-G-7872 Test Setup Photos of the EUT