2ADYY-A2Wireless Earphone

TECNO MOBILE LIMITED Date: 21 May，2020 To: Federal Communications Commission, Authorization & Evaluation Division, 7435 Oakland Mills Road, Columbia, MD 21046 To Whom It May Concern: The TECNO MOBILE LIMITED, the undersigned, hereby authorizes Mr. Wu Xuewen from Shenzhen BALUN Technology Co., Ltd., to act on the behalf of the TECNO MOBILE LIMITED solely in matters relating to the application for an FCC equipment authorization for FCC ID: 2ADYY-A2 including the signing of documents in connection with this Application. Necessary acts carried out by Shenzhen BALUN Technology Co., Ltd. in connection with the Application shall have the same effect as acts of the TECNO MOBILE LIMITED. The TECNO MOBILE LIMITED 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. Section 862. Yours Sincerely, (signature) Print name: Yiting.Luo Title: Mangaer TECNO MOBILE LIMITED

Annex No.: BL-SZ2050505-AW 1 / 4 EUT EXTERNAL PHOTOS FRONT VIEW OF EUT REAR VIEW OF EUT Annex No.: BL-SZ2050505-AW 2 / 4 LEFT SIDE VIEW OF EUT RIGHT SIDE OF EUT Annex No.: BL-SZ2050505-AW 3 / 4 TOP VIEW OF EUT BOTTOM VIEW OF EUT Annex No.: BL-SZ2050505-AW 4 / 4 Accessory-USB Cable

Label Label location ID LABEL on the front surface of the product

Annex No.: BL-SZ2050505-AI 1 / 3 EUT INTERNAL PHOTOS EUT UNCOVER VIEW EUT UNCOVER VIEW Annex No.: BL-SZ2050505-AI 2 / 3 MAIN BOARD TOP VIEW MAIN BOARD REAR VIEW PCB Antenna RF Chip Annex No.: BL-SZ2050505-AI 3 / 3 Battery Photo (FRONT) Battery Photo (REAR)

RF Exposure Evaluation for FCC ID: 2ADYY-A2 Refer user manual this device is a Wireless Earphone, and this device was designed used in portable devices that the minimum distance between human’s body is 5mm. Based on the 47CFR 2.1093, this device belongs to portable device. The definition of the category as following: Portable Derives: CFR Title 47 §2.1093(b) (b) For purposes of this section, a portable device is defined as a transmitting device designed to be used so that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user. FCC KDB 447498 D01 General RF Exposure Guidance v06 Limit 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. 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. 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 • The result is rounded to one decimal place for comparison 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 is applied to determine SAR test exclusion. Test data Bluetooth Mode BR+EDR BLE GFSK ∏/4-DQPSK 8-DPSK GFSK Peak Power (dBm) -3.52 -1.22 -0.88 -3.70 Note: This report listed the worst case peak power value, please refer to RF test report for more details. Turn-up power Mode Range (dBm) Bluetooth (-5.00)-(-0.50) FCC exclusion condition= [0.89 mW/5 mm] · [√2.48 GHz] = 0.28 ＜ 3.0 RF Exposure Evaluation Result: Pass Note: More power data, Please refer to the RF report.

Report No.: BL-SZ2050505-601 2 / 74 Revision History Version Issue Date Revisions Content Rev. 01 Jun. 04, 2020 Initial Issue TABLE OF CONTENTS 1 ADMINISTRATIVE DATA (GENERAL INFORMATION) .......................................................................... 5 1.1 Identification of the Testing Laboratory ....................................................................................... 5 1.2 Identification of the Responsible Testing Location ...................................................................... 5 1.3 Laboratory Condition ................................................................................................................... 5 1.4 Announce .................................................................................................................................... 6 2 PRODUCT INFORMATION ...................................................................................................................... 7 2.1 Applicant Information ................................................................................................................... 7 2.2 Manufacturer Information ............................................................................................................ 7 2.3 Factory Information ..................................................................................................................... 7 2.4 General Description for Equipment under Test (EUT) ................................................................ 7 2.5 Technical Information .................................................................................................................. 8 2.6 Additional Instructions ................................................................................................................. 9 3 SUMMARY OF TEST RESULTS ............................................................................................................ 10 3.1 Test Standards .......................................................................................................................... 10 3.2 Verdict ....................................................................................................................................... 10 4 GENERAL TEST CONFIGURATIONS ................................................................................................... 11 4.1 Test Environments .................................................................................................................... 11 4.2 Test Equipment List ................................................................................................................... 11 4.3 Measurement Uncertainty ......................................................................................................... 12 4.4 Description of Test Setup .......................................................................................................... 13 4.4.1 For Antenna Port Test ............................................................................................................... 13 4.4.2 For AC Power Supply Port Test ................................................................................................ 13 4.4.3 For Radiated Test (Below 30 MHz) ........................................................................................... 14 4.4.4 For Radiated Test (30 MHz-1 GHz) .......................................................................................... 14 4.4.5 For Radiated Test (Above 1 GHz) ............................................................................................. 15 4.5 Measurement Results Explanation Example ............................................................................. 16 4.5.1 For conducted test items: .......................................................................................................... 16 5 TEST ITEMS ........................................................................................................................................... 17 Report No.: BL-SZ2050505-601 3 / 74 5.1 Antenna Requirements .............................................................................................................. 17 5.1.1 Relevant Standards ................................................................................................................... 17 5.1.2 Antenna Anti-Replacement Construction .................................................................................. 17 5.1.3 Antenna Gain ............................................................................................................................ 17 5.2 Frequency Hopping Systems .................................................................................................... 18 5.2.1 Relevant Standards ................................................................................................................... 18 5.2.2 Description of the systems ........................................................................................................ 18 5.3 Number of Hopping Frequencies .............................................................................................. 20 5.3.1 Limit ........................................................................................................................................... 20 5.3.2 Test Setup ................................................................................................................................. 20 5.3.3 Test Procedure .......................................................................................................................... 20 5.3.4 Test Result ................................................................................................................................ 20 5.4 Peak Output Power ................................................................................................................... 21 5.4.1 Test Limit .............................................................…

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Annex No.: BL-SZ2050505-AR 1 / 5 TEST SETUP PHOTOS 1 Radiated Test Photo Below 30MHz 30MHz-1 GHz Annex No.: BL-SZ2050505-AR 2 / 5 Close-up Above 1GHz Annex No.: BL-SZ2050505-AR 3 / 5 Close-up 2 Conducted Test Photo Conducted Test-BT3.0 Annex No.: BL-SZ2050505-AR 4 / 5 Conducted Test-BLE 3 Conducted Emissions Test Photo 1 Annex No.: BL-SZ2050505-AR 5 / 5 Test Photo 2 S