2BGXQ-RT06Bluetooth transmitter and receiver in one

Shenzhen Kemaida Electronic Technology Co., Ltd. U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: 10/9/2024 Ref: Attestation Statement – Part2.911(d)(7) filing FCC ID ：2BGXQ-RT06 Shenzhen Kemaida Electronic Technology Co., Ltd. (“the applicant”) certifies that, as of the date of the filing of the application, THREE STONES MEDIA LLC(“the agent”) is our designated U.S. agent for service of process for the abovereference FCC ID. The applicant accepts to maintain an agent for service of process in the United States forno less than two year after either the grantee has permanently terminated all marketing and importation of theapplicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicialproceeding involving the equipment, whichever is later. The applicant further acknowledges it is ourresponsibility to inform the FCC whenever the agent information changes. THR EE STONES MEDIA LLC ("the agent) understand it is the agent's obligation to accept service of process in the United States for matters related to the applicable equipment, and at the physical U.S. address and email address. Designated U.S. Agent Company Name: THREE STONES MEDIA LLC FRN: 0033401761 GC: 2A99E Address: 1200 Broadway St. APT 329, Los Angeles, CA90015 Signature: Contact Person: Sijie Zhang Tel: +1 267 909 3692 Email: [email protected] Applicant Company Name: Shenzhen Kemaida Electronic Technology Co., Ltd. Address: Room 1409C10, Building B, Zhongshen Garden, No. 2010 Caitian Road, Fushan Community, Futian Street, Futian District, Shenzhen,China Signature: Hongtao Wang GC: 2BGXQ FRN: 0035405935 Tel: 13302991588 Email: [email protected]

Shenzhen Kemaida Electronic Technology Co., Ltd. 2.911 (d)(5)(ii) Applicant Attestation v1.3 Section 2.911(d)(5)(ii) Certification – Applicant (Covered List ) Company name: Shenzhen Kemaida Electronic Technology Co., Ltd. Address: Room 1409C10, Building B, Zhongshen Garden, No. 2010 Caitian Road, Fushan Community, Futian Street, Futian District, Shenzhen,China Product Name: Bluetooth transmitter and receiver in one FCC ID: 2BGXQ-RT06 Model(s): RT06, RT10, FM01, FM02, FM03, RT16, RT08, RT18, RT20, RT21 2.911(d)(5)(ii) Applicant filing We, [Shenzhen Kemaida Electronic Technology Co., Ltd.] (“the applicant”) certify that, as of the date of the filing of the application, the applicant is not identified NOTE 1 on the “Covered List” NOTE 2 ,established pursuant to §1.50002 of this chapter,as an entity producing coveredcommunications equipment. The applicant is not a named entity or any of its subsidiaries or affiliates. Yours sincerely, Name: Hongtao Wang Date: 10/9/2024 Title and Company name: manager / Shenzhen Kemaida Electronic Technology Co., Ltd. NOTE 1 Delete option not applicable to this application. NOTE 2 “Covered List”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com Shenzhen Kemaida Electronic Technology Co., Ltd. 2.911 (d)(5)(ii) Applicant Attestation v1.3 munications-supply-chain-through-the

Shenzhen Kemaida Electronic Technology Co., Ltd. 2.911 (d)(5)(i) Equipment Type Attestation v1.2 Section 2.911(d)(5)(i) Certification – EquipmentType Company name: Shenzhen Kemaida Electronic Technology Co., Ltd. Address: Room 1409C10, Building B, Zhongshen Garden, No. 2010 Caitian Road, Fushan Community, Futian Street, Futian District, Shenzhen,China Product Name: Bluetooth transmitter and receiver in one FCC ID: 2BGXQ-RT06 Model(s): RT06, RT10, FM01, FM02, FM03, RT16, RT08, RT18, RT20, RT21 2.911(d)(5)(i) EquipmentType We, [Shenzhen Kemaida Electronic Technology Co., Ltd.] (“the applicant”) certify that the equipment for which authorization is sought through certification is not:  Prohibited from receiving an equipment authorization pursuant to § 2.903; of the FCC rules.  Identified as an equipment type in the “Covered List” NOTE 1 Yours sincerely, Name: Hongtao Wang Date: 10/11/2024 Title and Company name: manager / Shenzhen Kemaida Electronic Technology Co., Ltd. NOTE 1 “Covered List”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

Shenzhen Kemaida Electronic Technology Co., Ltd. Date: October 11, 2024 FCC ID: 2BGXQ-RT06 Model Number: RT06, RT10, FM01, FM02, FM03, RT16, RT08, RT18, RT20, RT21 To: Federal Communication Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21048 To Whom It May Concern, We, Shenzhen Kemaida Electronic Technology Co., Ltd. declare that this EUT (FCC ID: 2BGXQ-RT06) will conduct FCC compliance testing, the SDOC part recognized test lab(Shenzhen NTEK Testing Technology Co., Ltd.( ShenZhen Lab.). 1/F, Building E, Fenda Science Park, Sanwei Community,Xixiang Street Bao’an District, Shenzhen 518126 P.R. China) Please contact me if you have any question. Sincerely, (Signed) Name / Title: Hongtao Wang/ manager Company: Shenzhen Kemaida Electronic Technology Co., Ltd. Address: Room 1409C10, Building B, Zhongshen Garden, No. 2010 Caitian Road, Fushan Community, Futian Street, Futian District, Shenzhen,China

< Shenzhen Kemaida Electronic Technology Co., Ltd. > Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 10/9/2024 Subject; Request for Confidentiality FCC ID: 2BGXQ-RT06 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 Operational Description Tune up procedure BOM 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: Hongtao Wang Title: manager Email: [email protected]

G:\电磁兼容部\RF项目组\RF项目\2024\4月\S24042900202E 深圳科迈达电子 蓝牙发射器和接收器二合一 RT06.RT10. FM01. FM02. FM03.RT16. RT08.RT18.RT20.RT21 FCC ID RF\7. Others\Letter\FCC POA Letter.docx (Shenzhen Kemaida Electronic Technology Co., Ltd.) Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Date: 10/9/2024 SUBJECT: FCC Application for FCC ID: 2BGXQ-RT06 To Whom It May Concern: We, the undersigned, hereby authorize Alex Li at Shenzhen NTEK Testing Technology Co., Ltd. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Shenzhen NTEK Testing Technology Co., Ltd. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, (signature) (printed name): Hongtao Wang

Shenzhen Kemaida Electronic Technology Co., Ltd. Family models declaration letter. 10/9/2024 We Company: Shenzhen Kemaida Electronic Technology Co., Ltd. Address: Room 1409C10, Building B, Zhongshen Garden, No. 2010 Caitian Road, Fushan Community, Futian Street, Futian District, Shenzhen,China Model Name: RT06 Family Model: RT10, FM01, FM02, FM03, RT16, RT08, RT18, RT20, RT21 Except for the appearance color, the circuits and RF modules of all models are the same. We (Shenzhen Kemaida Electronic Technology Co., Ltd.) hereby state that all the models are electrical identical including the same software parameter and hardware design (i.e., circuit design, PCB Layout, RF module/circuit, antenna type(s) and antenna location, components on PCB, etc.), same mechanical structure and design (including product enclosure, materials, etc.), the only difference is the appearance. Thanks Sincerely, Signature [Name] Hongtao Wang [Title] Manager [email protected]

Size:36*15mm Bluetooth transmitter and receiver in one Model:RT06 FCC ID:2BGXQ-RT06 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.

FCC ID: 2BGXQ-RT06 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. Modulation Channel Freq. (GHz) EIRP power (dBm) EIRP power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) SAR test exclusion GFSK 4.973.145±1 6 3.98<51.234003.00YES 5.703.725±1 6 3.98<51.243983.00YES 5.983.965±1 6 3.98<51.253883.00YES π/4- DQPSK 5.493.546±1 7 5.01<51.553523.00YES 6.224.196±1 7 5.01<51.566083.00YES 6.504.476±1 7 5.01<51.578543.00YES 8-DQPSK 5.793.796±1 7 5.01<51.553523.00YES 6.434.406±1 7 5.01<51.566083.00YES 6.684.666±175.01<51.578543.00YES BLE1M 5.163.286±1 7 5.01<51.553523.00YES 5.833.836±1 7 5.01<51.565763.00YES 6.144.116±175.01<51.578543.00YES BLE2M 5.203.316±1 7 5.01<51.553523.00YES 5.853.856±1 7 5.01<51.565763.00YES 6.154.126±1 7 5.01<51.578543.00YES Result calculation SAR Exclusion threshold 2.402 2.441 2.480 2.402 2.441 2.480 2.402 2.441 2.480 2.402 2.440 2.480 2.402 2.440 2.480 Conclusion: For the max result : 1.57854 ≤ 3.0 for 1g SAR, SAR is not required. Signature: Date: 2024-07-19 NAME AND TITLE (Please print or type): Alex li /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 P.R. China.

Report No.: S24042900202002E Version.1.3 Page 1 of 78 RADIO TEST REPORT FCC ID: 2BGXQ-RT06 Product: Bluetooth transmitter and receiver in one Trade Mark: N/A Model No.: RT06 Family Model: RT10, FM01, FM02, FM03, RT16, RT08, RT18, RT20, RT21 Report No.: S24042900202002E Issue Date: Jun 25, 2024 Prepared for Shenzhen Kemaida Electronic Technology Co., Ltd. Room 1409C10, Building B, Zhongshen Garden, No. 2010 Caitian Road, Fushan Community, Futian Street, Futian 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.: S24042900202002E Version.1.3 Page 2 of 78 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 .................................................................................................................................... 14 7.1 CONDUCTED EMISSIONS TEST ............................................................................................................... 14 7.1.1 Applicable Standard .................................................................................................................................. 14 7.1.2 Conformance Limit ................................................................................................................................... 14 7.1.3 Measuring Instruments ............................................................................................................................. 14 7.1.4 Test Configuration .................................................................................................................................... 14 7.1.5 Test Procedure ........................................................................................................................................... 14 7.1.6 Test Results ................................................................................................................................................ 15 7.2 RADIATED SPURIOUS EMISSION ............................................................................................................ 17 7.2.1 Applicable Standard .................................................................................................................................. 17 7.2.2 Conformance Limit ................................................................................................................................... 17 7.2.3 Measuring Instruments ............................................................................................................................. 18 7.2.4 Test Configuration .................................................................................................................................... 18 7.2.5 Test Procedure ........................................................................................................................................... 19 7.2.6 Test Results ................................................................................................................................................ 20 7.3 6DB BANDWIDTH ....................................................................................................................................... 26 7.3.1 Applicable Standard .................................................................................................................................. 26 7.3.2 Conformance Limit ................................................................................................................................... 26 7.3.3 Measuring Instruments ............................................................................................................................. 26 7.3.4 Test Setup .................................................................................................................................................. 26 7.3.5 Test Procedure ........................................................................................................................................... 26 7.3.6 Test Results .......................................................................................................…

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Productspecification QuickReferenceDate Antennamoduleonthesystemboard FrequencRange2400~2500MHz Ant.PortInputPwr.(dBm)0(Typ.BTclass2outputpower) Tot.Rad.Pwr.(dBm)-1.2(Inputpwr-losspwr) PeakEIRP(dBm)1.2 Directivity(dBi) 1(alldirectionantenna) Efficiency(dB) 60.2% Gain(dBi)1.2(AvgGainXY-plane) MaximumPower(dBm)1.7(XY-plane) MinimumPower(dBm)-4(XY-plane) Avg.Power(dBm)-0.5(XY-plane) InputImpendence(ohm)50 PolarizationType Vertical&Horizontal V.S.W.R <1.4 ManufactureZHUHAIJIELITECHNOLOGYCO.,LTD Allthetechnicaldataandinformationcontainedhereinaresubjecttochangewithoutpriornotice AntennaLayout&moduleonthesystemboard AntennaGain GainTable [email protected] Peak Avg. Peak Avg. Peak Avg. ModuleBoard 1.2-0.51.9-3.61.1-3.0 60.2% RetumLoss TheEnvironmentofAntennaRadiationPattem 3Dradiationpatterndiagram XY-planeXZ-planeYZ-plane