2AVUT-KX620Wireless microphone

Microphone operating instructions Start-up: Short press the transmitter intermediate power key and the receiver power key. Shutdown: Press the transmitter intermediate power key and the receiver power key for 3 seconds. This product has been paired by default when it leaves the factory. It can be used on boot. If multiple machines use serial frequency at the same time, just press the boot button of transmitter to change frequency. One transmitter of this product can be used in pairs with up to 10 receivers at the same time. In the case of replacement of transmitting or receiving equipment, it is necessary to re-pair. The operation instructions are as follows: 1Transmitter operation: Press the boot button for 5 seconds, when the power indicator flashes once, then press the transmitter boot button once quickly, and when you see the power indicator flashing, you enter the matching mode. 2Receiver operation: After the transmitter enters the matching mode, turn on the receiver, wait 2 seconds and press the transmitter&apos;s boot button 1 to complete the frequency matching. At this time, you can speak to the microphone to test the voice. If the matching is successful, the receiver will flash red light when speaking. Exit pairing: The frequency can be automatically locked and matched by pressing the startup key of the transmitter. USB cable: length 22 cm, Black Frequency range: 560MHz-579MHz Modulation mode: digital modulation Signal to noise ratio: 96dB Frequency response: 30Hz-18KHz Antenna Type: Internal antenna Antenna Gain:-3dBi Distortion: <0.1% Dynamic range: 96dB Delay: 2.5ms Frequency points: up to 48 Transmitter power: 10mW Receiver sensitivity: -96dB Use time of transmitter: 5 hours 3.7V 400mAh Receiver service time: 5 hours 3.7V 400mAh Charging time: 2 hours Charging adapter: 5V 800mA FCC Warning Statement Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 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. 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.

Enping City Yongyue Electroacoustic Equipment factory Agent Authorization Company: Enping City Yongyue Electroacoustic Equipment factory Address: The 2nd Foor workshop of workshop No. C5-1, Zone 2, Industrial park, enping City, Guangdong Province, China Product Name: Wireless microphone Model Number(s ): KX620, KX621, KX622, KX6512C, KX6515C, KX6515D, KX623, KX801 Product Description: Wireless microphone We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: Mar. 13, 2020 Name: Huan Zhou Title: General Manager Company: Enping City Yongyue Electroacoustic Equipment factory

Enping City Yongyue Electroacoustic Equipment factory Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: Mar. 13, 2020 Subject; Request for Confidentiality FCC ID: 2AVUT-KX620 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 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: Huan Zhou Title: General Manager

Model Difference Declaration To Whom It May Concern, We, Enping City Yongyue Electroacoustic Equipment factory(Wireless microphone) Trademark:superadd; Model Number: KX620, KX621, KX622, KX6512C, KX6515C, KX6515D, KX623, KX801; All model’s the function, s oftware and electric circuit are the same, only with a product color and model named different for c ommercial purpose. Test sample model: KX620 . Please contact me if you have any question. Name: Huan Zhou Date: Mar. 13, 2020 Title: General Manager Signature of applicant:

Annex A External Photos Report No.: HK2003050245-E Page 1 of 4 Report No.: HK2003050245-E Page 2 of 4 Report No.: HK2003050245-E Page 3 of 4 Report No.: HK2003050245-E Page 4 of 4

FCC ID LABEL: Ca. 5mm x 10mm Include in manual: 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. Label Location FCC ID: 2AVUT-KX620

Annex B Internal Photos Report No.: HK2003050245-E Page 1 of 4 Report No.: HK2003050245-E Page 2 of 4 Report No.: HK2003050245-E Page 3 of 4 A N T. Report No.: HK2003050245-E Page 4 of 4

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description Wireless microphone Model Name KX620 FCC ID 2AVUT-KX620 2. EVALUATION METHOD According to 447498 D01 General RF Exposure Guidance v05 The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(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 3. CALCULATION According to the follow transmitter output power（P t ）formula： Pt=-6.32dBm=0.23mW The result for RF exposure evaluation SAR= (0.23mW /5mm) .[√0.5786(GHz)]=0.034<3.0 for 1-g SAR 4. CONCLUSION The SAR evaluation is not required.

Page 1 of 27 Report No.:HK2003050245-E FCC TEST REPORT Test report On Behalf of Enping City Yongyue Electroacoustic Equipment factory For Wireless microphone Model No.: KX620, KX621, KX622, KX6512C, KX6515C, KX6515D, KX623, KX801 FCC ID: 2AVUT-KX620 Prepared for : Enping City Yongyue Electroacoustic Equipment factory The 2nd Foor workshop of workshop No. C5-1, Zone 2, Industrial park, enping City, Guangdong Province, China Prepared By : Shenzhen HUAK Testing Technology Co., Ltd. 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen City, China Date of Test: Feb. 27, 2020 ~ Mar. 05, 2020 Date of Report: Mar. 05, 2020 Report Number: HK2003050245-E Page 2 of 27 Report No.:HK2003050245-E TEST RESULT CERTIFICATION Applicant’s name ................. : Enping City Yongyue Electroacoustic Equipment factory Address .................................. : The 2nd Foor workshop of workshop No. C5-1, Zone 2, Industrial park, enping City, Guangdong Province, China Manufacture's Name ............ : Enping City Yongyue Electroacoustic Equipment factory Address .................................. : The 2nd Foor workshop of workshop No. C5-1, Zone 2, Industrial park, enping City, Guangdong Province, China Product description Trade Mark ................................ : superadd Product name ............................ : Wireless microphone Model and/or type reference : KX620, KX621, KX622, KX6512C, KX6515C, KX6515D, KX623, KX801 Standards ............................. : FCC Rules and Regulations Part 15 Subpart C Section 15.236 ANSI C63.4: 2014 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK 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. Date of Test ............................................ : Date (s) of performance of tests .............. : Feb. 27, 2020 ~ Mar. 05, 2020 Date of Issue ........................................... : Mar. 05, 2020 Test Result ............................................... : Pass Testing Engineer : (Gary Qian) Technical Manager : (Eden Hu) Authorized Signatory : (Jason Zhou) Page 3 of 27 Report No.:HK2003050245-E TABLE OF CONTENTS 1 TEST SUMMARY ................................................................................................................................................. 4 1.1 TEST PROCEDURES AND RESULTS ............................................................................................................................... 4 1.2 TEST FACILITY .............................................................................................................................................................. 4 1.3 Measurement Uncertainty .......................................................................................................................................... 4 2 GENERAL INFORMATION.................................................................................................................................... 5 2.1 GENERAL DESCRIPTION OF EUT .................................................................................................................................. 5 2.2 Carrier Frequency of Channels .................................................................................................................................... 6 2.3 Operation of EUT during testing ................................................................................................................................. 6 2.4 DESCRIPTION OF TEST SETUP ...................................................................................................................................... 7 2.5 Description of Support Units ....................................................................................................................................... 7 3 TEST RESULTS AND MEASUREMENT DATA ......................................................................................................... 9 3.1 CONDUCTED EMISSIONS TEST .................................................................................................................................... 9 3.2 RADIATED EMISSION TEST ........................................................................................................................................ 12 3.4Conducted Output Power ........................................................................................................................................... 17 3.5OCCUPIED BANDWIDTH MEASUREMENT .................................................................................................................. 18 3.5Necessary bandwidth ................................................................................................................................................. 20 3.6 FREQUENCY STABILITY .............................................................................................................................................. 23 4 PHOTOGRAPH OF TEST .................................................................................................................................... 25 5 PHOTOGRAPH OF EUT ...................................................................................................................................... 27 Page 4 of 27 Report No.:HK2003050245-E 1 TEST SUMMARY 1.1 TEST PROCEDURES AND RESULTS Requirement CFR 47 Section Result Conducted Emission 15.207 PASS Conducted Peak Output Power 15.236(d)(1) PASS Occupied Bandwidth Emission 15.236(f)(2) PASS Radiated Spurious Emission 15.236(g) PASS Frequency Stability 15.236(f)(3) PASS Note: 1. PASS: Test item meets the requirement. 2. Fail: Test item does not meet the requirement. 3. N…

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Test Model：KX620 Radiated Emission Conducted Emission