2A22V-MIS112BDuet Bluetooth Dual Karaoke Microphone

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Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch) Agent Authorization Company: Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch) Address: 4th Floor, #5 Building, #189, Yongji Industrial, Zhuweitian, Fenggang Town, Dongguan, China Product Name: Duet Bluetooth Dual Karaoke Microphone Model Number(s): MI-S112B Product Description: Duet Bluetooth Dual Karaoke 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: Dec. 08, 2022 Name: Winnie He Title: Sales Company: Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch)

Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch) Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: Dec. 08, 2022 Subject; Request for Confidentiality FCC ID: 2A22V-MIS112B 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 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 pursuantto 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: Winnie He Title: Sales

Annex A External Photos Report No.: HK2206202654-E Page 1 of 4 Report No.: HK2206202654-E Page 2 of 4 Report No.: HK2206202654-E Page 3 of 4 Report No.: HK2206202654-E Page 4 of 4

FCC ID LABEL: Ca. 10mm x 40mm label location FCC ID: 2A22V‐MIS112B

Annex B Internal Photo Report No.: HK2206202654-E Page 1 of 5 Report No.: HK2206202654-E Page 2 of 5 Antenna Report No.: HK2206202654-E Page 3 of 5 Report No.: HK2206202654-E Page 3 of 5 Report No.: HK2206202654-E Page 4 of 5 Report No.: HK2206202654-E Page 5 of 5

FCC RF Exposure EUT Description: Duet Bluetooth Dual Karaoke Microphone Model No.: MI‐S112B FCC ID: 2A22V‐MIS112B 1. Limits According to KDB 447498 D01 General RF Exposure Guidance v06 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: Result=P/D*√F F= the RF channel transmit frequency in GHz P=Maximum turn‐up power in mw D=Min. test separation distance in mm 2. Test Result of RF Exposure Evaluation Frequency (MHz) Output power （dBm） Tune Up Power （dBm） Max Tune Up power dBm/mW Min test separati on distance mm Result Limit (mW/cm 2 ) SAR Test Exclusion 2480 4.25 4±1 5/3.16 5 0.995 3.0 Pass Note: PK Output power= conducted power. Conducted power see the test report HK2206202654‐E, antenna gain=‐0.58dBi The certified sample is portable device, Per KDB 447498 D01, when the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine RF Exposure test exclusion. The test exclusion threshold is 0.995 which is<= 3, RF Exposure testing is not required. Note: Exclusion Thresholds Results=[(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ·[√f (GHz)] f(GHz) is the RF channel transmit frequency in GHz Distance=5mm

Inverted F Antenna Specification Summary ITEM ANT SPEC Model Name 2.4G ANT Horizontal Vertical 2400MHz 2400MHz2500MHz2400MHz2400MHz 2500MHz Center Frequency -1.26 -0.76 -0.58 -5.25 -2.46 -1.86 MAX. Gain -0.58dB Polarization Horizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance 50 Ohm Antenna Length 38.20mm Manufacture ZHUHAI JIELI TECHNOLOGY CO.,LTD Antenna Photo & Length (mm) Horizontal: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -40 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -1.26174 -30.0801 -7.18716 2450 -0.765802 -36.5604 -7.48023 2500 -0.585582 -22.0315 -6.59127 Vertical: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -30 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -5.2537 -22.1424 -12.4294 2450 -2.4652 -24.5837 -10.4702 2500 -1.86120 -29.5214 -9.20432 ANT Test Labs：Attestation of Global Compliance Co., Ltd.

Page 1 of 47 Report No.: HK2206202654-E TEST REPORT FCC PART 15 SUBPART C 15.247 Test report On Behalf of Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch) For Duet Bluetooth Dual Karaoke Microphone Model No.: MI-S112B FCC ID: 2A22V-MIS112B Prepared For : Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch) 4th Floor, #5 Building, #189, Yongji Industrial, Zhuweitian, Fenggang Town, Dongguan, China Prepared By : Shenzhen HUAK Testing Technology Co., Ltd. 1-2/F., Building B2, Junfeng Zhongcheng Zhizao Innovation Park, Heping, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Date of Test: Jul. 19, 2022 ~ Jul. 27, 2022 Date of Report: Jul. 27, 2022 Report Number: HK2206202654-E Page 2 of 47 Report No.: HK2206202654-E TEST RESULT CERTIFICATION Applicant’s name ................. : Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch) Address .................................. : 4th Floor, #5 Building, #189, Yongji Industrial, Zhuweitian, Fenggang Town, Dongguan, China Manufacture's Name ............ : Shenzhen DXR Electronic Technology Co., Limited (Dongguan Branch) Address .................................. : 4th Floor, #5 Building, #189, Yongji Industrial, Zhuweitian, Fenggang Town, Dongguan, China Product description Trade Mark: N/A Product name ............................ : Duet Bluetooth Dual Karaoke Microphone Model and/or type reference : MI-S112B Standards .............................. : 47 CFR FCC Part 15 Subpart C 15.247 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 ............. : Jul. 19, 2022 ~ Jul. 27, 2022 Date of Issue .......................................... : Jul. 27, 2022 Test Result .............................................. : Pass Prepared by: Project Engineer Reviewed by: Project Supervisor Approved by: Technical Director Page 3 of 47 Report No.: HK2206202654-E Table of Contents Page 1. SUMMARY............................................................................................................................................................ 5 1.1. TEST STANDARDS ..................................................................................................................................................... 5 1.2. TEST DESCRIPTION ................................................................................................................................................... 5 1.3. INFORMATION OF THE TEST LABORATORY ............................................................................................................. 6 1.4. STATEMENT OF THE MEASUREMENT UNCERTAINTY ............................................................................................... 6 2. GENERAL INFORMATION ....................................................................................................................................... 7 2.1. ENVIRONMENTAL CONDITIONS ............................................................................................................................... 7 2.2. GENERAL DESCRIPTION OF EUT ............................................................................................................................... 7 2.3. DESCRIPTION OF TEST MODES AND TEST FREQUENCY ............................................................................................ 8 2.4. EQUIPMENTS USED DURING THE TEST .................................................................................................................... 9 2.5. RELATED SUBMITTAL(S) / GRANT (S) ........................................................................................................................ 9 2.6. MODIFICATIONS ...................................................................................................................................................... 9 2.7. DESCRIPTION OF TEST SETUP ................................................................................................................................ 10 3. TEST CONDITIONS AND RESULTS ......................................................................................................................... 11 3.1. CONDUCTED EMISSIONS TEST ............................................................................................................................... 11 3.2. RADIATED EMISSIONS AND BAND EDGE ................................................................................................................ 14 3.3. MAXIMUM PEAK CONDUCTED OUTPUT POWER ................................................................................................... 25 3.4. 20DB BANDWIDTH ................................................................................................................................................ 26 3.5. FREQUENCY SEPARATION ...................................................................................................................................... 29 3.6. NUMBER OF HOPPING FREQUENCY ...................................................................................................................... 31 3.7. TIME OF OCCUPANCY (DWELL TIME) ..................................................................................................................... 33 3.8. OUT‐OF‐BAND EMISSIONS ..................................................................................................................................... 36 3.9. PSEUDORANDOM FREQUENCY HOPPING SEQUENCE .......................................................................................…

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MI-S112B Radiated Emissions Conducted Emission