2BCOS-WITIBMTSETWiti BMT Set

1/1 US Agent for Service of ProcessLETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: THREE STONES MEDIA LLC FRN: 0033401761 Contact Name: Sijie Zhang Address: 1200 Broadway St. APT 329, Los Angeles, CA90015 Telephone No: +1 267 909 3692 Email: [email protected] Applicant: Company name: Shenzhen Witi Sports Technology Co., Ltd Product Description: Witi BMT Set Grantee code: 2BCOS FCC ID: 2BCOS-WITIBMTSET FRN: 0034180034 Contact Name: Yuejiu Zhao Address: 3rd Floor, Building R2-B, No. 020 Gaoxin South 7th Road, Nanshan District, Shenzhen, China Telephone No: 16604319682 Email: [email protected] [Shenzhen Witi Sports Technology Co., Ltd] certifies that, as of the date of this filing of the application with the TCB, [THREE STONES MEDIA LLC] is our designated US agent for service of process for the above referenced FCC ID. [Shenzhen Witi Sports Technology Co., Ltd] accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any commission related proceeding involving equipment. [THREE STONES MEDIA LLC] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicantis aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. 1/1 Date: 22/09/2023 Applicant’s Name: Yuejiu Zhao US Agent’s Name: Sijie Zhang Title: Manager Title: President Signature Signature

C5266091_X10_Ed.2 1/1 < Shenzhen Witi Sports Technology Co., Ltd > Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046Date: 22/09/2023 Subject: Request for Confidentiality FCC ID: 2BCOS-WITIBMTSET To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules (47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location Attestation Statement External Photos Block Diagram Schematics Test Report Test Setup Photos User’s Manual NOTE 1 Internal Photos NOTE 1 Parts List / Tune Up / BOM List RF Exposure Info Operational Description Cover Letter(s) FCC Software Security Requirements for UNII devices NOTE 1: Long-Term Confidentiality may be permitted under special conditions (See II. LONG-TERM CONFIDENTIALITY, Section 3 of KDB 726920, use last in force) NOTE 2: Short-Term Confidentiality can be requested for a maximum of 180 days from the date of the grant. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. In case of short-term Confidentiality, the applicant requests the exhibits selected above are withheld from public view for a period of _180_ days from the date of the Grant of Equipment Authorization and prior to marketing. C5266091_X10_Ed.2 1/1 It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Yuejiu Zhao Title: Manager

ATTACHMENT PHOTOGRAPHS OF EUT Photo 1 Photo 2 Photo 3 Photo 4 Photo 5 Photo 6 Photo 7 Photo 8 Photo 9 Photo 10 Photo 11

LABEL LOCATION

ATTACHMENT PHOTOGRAPHS OF EUT Photo 1 Photo 2 Photo 3 Photo 4 BT ANT Photo 5 Photo 6 Photo 7

FCC ID: 2BCOS-WITIBMTSET Portable device According to §15.247(e)(i) and §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 KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. BLE: Antenna Type: FPCB Antenna Antenna Gain: 2.91 dBi Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n 1g SAR Exclusion threshold SAR test exclusion 2.402 -0.63 0.865-1±10.01.000<50.309973.00YES 2.44 -0.74 0.843-1±10.01.000<50.312413.00YES 2.480 -1.2 0.759-1±10.01.000<50.314963.00YES 2.402 -0.66 0.859-1±10.01.000<50.309973.00YES 2.44 -0.8 0.832-1±10.01.000<50.312413.00YES 2.480 -1.25 0.750-1±10.01.000<50.314963.00YES BLE(1M) BLE(2M) Conclusion: For the max result : 0.31496≤ 3.0 for 1-g SAR, No SAR is required. Signature: Date: 2023-08-28 NAME AND TITLE (Please print or type): Alex /Manager COMPANY (Please print or type): Shenzhen NTEK Testing Technology Co., Ltd./ 1/F, Building E, Fenda Science Park, Sanwei Community, Xixiang Street Bao’an District, Shenzhen 518126 P.R. China

Shenzhen Huarui Haodi Technology Co. , Ltd. Specification Customer： Shenzhen Huarui Haodi Technology Co. , Ltd. Product： Bluetooth 2.4G antenna Model： HRHD-PCB-2.4G-P01 Number： HRHD-PCB-2.4G-P01 Room401，4th Floor，Mingjun Commercial Center,No.1 Langrong Road,Xinshi Community,Dalang Street,Longhua District,Shenzhen 2.General matters 1.1 Scope of application 1.2 Service temperature range The temperature range of this product is -20 ~ +65 °C 1.3 Storage temperature range This product is stored at -30 ~ +75 °C 3. General product specification NO.ITEMSDETAILS 1 type 2.4G Bluetooth antenna 2 band limits 2400MHz 3VSWR ≤ 2.0 4 Gain 2.91dBi 5Radiation Efficiency ≥ 50% 6 impedance 50 Ω 7 Antenna typemonopole 8 Antenna implementation form FPC material + 1.13 coaxial line 4.Product specification detail 4.1 Product structure parameter 4.2 Product material composition NoMaterialsSize (MM) 1 FPC material 39 mm * 3.5 mm * 0.16 mm 2 Coaxial lineØ1.13 / 30 mm I-PEX 4.3 appearance The product has good appearance, no scars, sweat, protrusions and other defects that seriously affect the appearance. 4.4 Structural dimension Refer to product drawing: 4.2 Product electrical performance test data 4.21Test environment and equipment Test environment: temperature： 10°C——+30°C relative humidity：≤80% （+40°C）barometric pressure：750mmkg ±30mmkg test equipment： HP8753DNetwork analyzer ETS：Microwave darkroom 4.22 Product electrical performance test data： S11 diagram of the product： （） Marker2400MHz2450MHz2500MHz5700MHz5900MHz Return loss -20.51-23.65-18.63 VSWR 1.211.191.34 Gain efficiency and pattern data： （MHz） 24002410242024302440245024602470248024902500 Gain （dBi） 2.912.902.822.712.732.892.592.792.472.112.15 Efficency （ % ） 37.838.138.0638.539.140.140.339.338.237.437.6 2400MHz ： band

Report No.: S23072600107001 Version.1.3 Page 1 of 70 RADIO TEST REPORT FCC ID: 2BCOS-WITIBMTSET Product: Witi BMT Set Trade Mark: N/A Model No.: WITI BMT-SET Family Model: N/A Report No.: S23072600107001 Issue Date: Aug 25, 2023 Prepared for Shenzhen Witi Sports Technology Co.，Ltd 3rd Floor, Building R2-B, No. 020 Gaoxin South 7th Road, Nanshan District, Shenzhen, China Prepared by Shenzhen NTEK Testing Technology Co., Ltd. 1/F, Building E, Fenda Science Park, Sanwei Community, Xixiang Street Bao’an District, Shenzhen 518126 P.R. China Tel. 400-800-6106, 0755-2320 0050, 0755-2320 0090 Website: http://www.ntek.org.cn Report No.: S23072600107001 Version.1.3 Page 2 of 70 TABLE OF CONTENTS 1 TEST RESULT CERTIFICATION ...................................................................................................................... 4 2 SUMMARY OF TEST RESULTS ......................................................................................................................... 5 3 FACILITIES AND ACCREDITATIONS ............................................................................................................. 6 3.1 FACILITIES..................................................................................................................................................... 6 3.2 LABORATORY ACCREDITATIONS AND LISTINGS ................................................................................. 6 3.3 MEASUREMENT UNCERTAINTY ............................................................................................................... 6 4 GENERAL DESCRIPTION OF EUT .................................................................................................................. 7 5 DESCRIPTION OF TEST MODES ..................................................................................................................... 9 6 SETUP OF EQUIPMENT UNDER TEST ......................................................................................................... 10 6.1 BLOCK DIAGRAM CONFIGURATION OF TEST SYSTEM ..................................................................... 10 6.2 SUPPORT EQUIPMENT ............................................................................................................................... 11 6.3 EQUIPMENTS LIST FOR ALL TEST ITEMS .............................................................................................. 12 7 TEST REQUIREMENTS .................................................................................................................................... 13 7.1 CONDUCTED EMISSIONS TEST ............................................................................................................... 13 7.1.1 Applicable Standard .................................................................................................................................. 13 7.1.2 Conformance Limit ................................................................................................................................... 13 7.1.3 Measuring Instruments ............................................................................................................................. 13 7.1.4 Test Configuration .................................................................................................................................... 13 7.1.5 Test Procedure ........................................................................................................................................... 13 7.1.6 Test Results ................................................................................................................................................ 14 7.2 RADIATED SPURIOUS EMISSION ............................................................................................................ 15 7.2.1 Applicable Standard .................................................................................................................................. 15 7.2.2 Conformance Limit ................................................................................................................................... 15 7.2.3 Measuring Instruments ............................................................................................................................. 16 7.2.4 Test Configuration .................................................................................................................................... 16 7.2.5 Test Procedure ........................................................................................................................................... 17 7.2.6 Test Results ................................................................................................................................................ 18 7.3 6DB BANDWIDTH ....................................................................................................................................... 24 7.3.1 Applicable Standard .................................................................................................................................. 24 7.3.2 Conformance Limit ................................................................................................................................... 24 7.3.3 Measuring Instruments ............................................................................................................................. 24 7.3.4 Test Setup .................................................................................................................................................. 24 7.3.5 Test Procedure ........................................................................................................................................... 24 7.3.6 Test Results ................................................................................................................................................ 24 7.4 DUTY CYCLE .........................................................…

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Radiated Measurement Photos