2AXWI-M90True Wireless ANC Gaming Earphone

Date: 30 November 2020 5-Link Technology Co., Ltd To: Federal Communications Commission, Authorization & Evaluation Division, 7435 Oakland Mills Road, Columbia, MD 21046 To Whom It May Concern: The 5-Link Technology Co., Ltd, the undersigned, hereby authorizes Mr. Wu Xuewen from Shenzhen BALUN Technology Co., Ltd., to act on the behalf of the 5-Link Technology Co., Ltd solely in matters relating to the application for an FCC equipment authorization for FCC ID: 2AXWI-M90 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 5-Link Technology Co., Ltd. The 5-Link Technology Co., Ltd 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, _____ Cherry Lin

Date: 30 November 2020 5-Link Technology Co., Ltd To: Federal Communications Commission, Authorization & Evaluation Division, 7435 Oakland Mills Road, Columbia, MD 21046 Re: 5-Link Technology Co., Ltd FCC ID: 2AXWI-M90 FCC Certification Confidentiality Request Gentlemen: This letter is to comply with 47 CFR 0.457 and 0.459 pertaining to confidentiality material. 5-Link Technology Co., Ltd requests that the following documents regarding this submission for FCC ID: 2AXWI-M90 be kept confidential: Exhibit Type File Name Block Diagram Block Diagram.pdf Schematics Schematics.pdf Operational Description Operational Description.pdf And below exhibit kept short-term confidential (180 days): External photos External photos.pdf Test setup photos test photo.pdf Internal photos Internal photos.pdf User manual User manual.pdf Those documents contain detailed system and equipment description and related information about the product which 5-Link Technology Co., Ltd considers to be confidential proprietary, a custom design and, otherwise, not releasable to the general public. Since this design is a basis form which future technological products will evolve, 5-Link Technology Co., Ltd considers this information would be of benefit to its competitors, and that the disclosure of the information in these documents would give competitors an unfair advantage in the market. Yours Sincerely, Cherry Lin

Annex No.: BL-SZ20B0358-AW 1 / 4 EUT EXTERNAL PHOTOS FRONT VIEW OF EUT b REAR VIEW OF EUT Annex No.: BL-SZ20B0358-AW 2 / 4 LEFT SIDE VIEW OF EUT RIGHT SIDE OF EUT X Annex No.: BL-SZ20B0358-AW 3 / 4 TOP VIEW OF EUT c BOTTOM VIEW OF EUT Annex No.: BL-SZ20B0358-AW 4 / 4 Accessory-Charging Case

FCC ID: 2AXWI-M90 The device is too small to display FCC ID. FCC ID will display on user manual.

Annex No.: BL-SZ20B0358-AI 1 / 2 EUT INTERNAL PHOTOS MAIN BOARD TOP VIEW MAIN BOARD REAR VIEW Ceramic Antenna RF Chip Annex No.: BL-SZ20B0358-AI 2 / 2 Battery Photo (FRONT) Battery Photo (REAR)

RF Exposure Evaluation for FCC ID: 2AXWI‐M90 Refer user manual this device is a True Wireless ANC Gaming 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 GFSK π/4-DQPSK 8-DPSK Peak Power (dBm) -2.83 -0.52 -1.09 Note: This report listed the worst case peak power value, please refer to RF test Report No. BL- SZ20B0358-601, section A.2 Peak Output Power. Mode GFSK (BLE) Low Channel Middle Channel High Channel Peak Power (dBm) -2.81 -3.12 -3.51 Note: This report listed the worst case peak power value, please refer to RF test Report No. BL- SZ20B0358-602, section A.1 Output Power, Duty Cycle. Turn-up power Mode Power Range (dBm) Bluetooth (-4.00) - (-0.50) RF Exposure Evaluation Result Mode Tune-up limit power(dBm) Distance (mm) Calculation Frequency (MHz) Calculation Results Threshold Value Verdict Bluetooth -0.5 5.0 2441 0.3 3.0 Compliance ‐‐END OF REPORT‐‐

Report No.: BL-SZ20B0358-601 2 / 75 Revision History Version Issue Date Revisions Content Rev. 01 Dec. 09, 2020 Initial Issue Rev. 02 Dec. 14, 2020 Correct the data in section A.4 Rev. 03 Dec. 15, 2020 Correct the data in section A.7 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 ................................................................................................ 1 3 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 Report No.: BL-SZ20B0358-601 3 / 75 5 TEST ITEMS ........................................................................................................................................... 17 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 .................................................................................................... 1 8 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 and E.I.R.P ...........................................................................…

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Annex No.: BL-SZ20B0358-AR 1 / 4 TEST SETUP PHOTOS 1 Radiated Test Photo Below 30MHz 30MHz-1GHz Annex No.: BL-SZ20B0358-AR 2 / 4 Close-up Above 1GHz Annex No.: BL-SZ20B0358-AR 3 / 4 Close-up 2 Conducted Test Photo Conducted Test Annex No.: BL-SZ20B0358-AR 4 / 4 3 Conducted Emissions Test Photo 1 Test Photo 2