2BFZZ-K8K-8

Attestation Statements (August 7, 2024) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA RE: Attestation Statements Part 2.911(d)(7) request for (FCC ID: 2BFZZ-K8 ) (Guangzhou Yayin Electronic Technology Co., Ltd), the undersigned, hereby authorize (NEWENERGYER LIMITED) to act as our designated U.S. agent for service of process, (Guangzhou Yayin Electronic 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 the equipment. (NEWENERGYER LIMITED) accepts the responsibility to act as designated U.S. agent for service of process, provides 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 the equipment. Applicant Information： Company name: Guangzhou Yayin Electronic Technology Co., Ltd Contact Name: LUO JI Address: Tianhequ Jishanxinlujie4hao301-118 Guangzhoushi Guangdongsheng, China Telephone No: 13538214502 Email: [email protected] FRN: 0035312750 Signature [LUO JI] U.S. Agent Information: Company Name: NEWENERGYER LIMITED Address: 1818 S Patton Ct, Denver, CO, 80219 Contact Name: CHUN LIU Telephone No: 213 289 5042 Email: [email protected] FRN: 0034665885 Signature [CHUN LIU]

(Guangzhou Yayin Electronic Technology Co., Ltd) (August 7, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (FCC ID: 2BFZZ-K8) [Guangzhou Yayin Electronic Technology Co., Ltd] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, (Applicant signature) (Applicant printed name) LUO JI (Guangzhou Yayin Electronic Technology Co., Ltd) (August 7, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (FCC ID: 2BFZZ-K8) [Guangzhou Yayin Electronic Technology Co., Ltd] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) LUO JI

Guangzhou Yayin Electronic Technology Co., Ltd Model Difference Data：August 7, 2024 Product description: K-8 Model name: K-8, K-6, K-7, K-9, K-10, K11, K12, K13, G-6, G-7, G-8, G-9, SM58 Trade Name: NXG FCC ID: 2BFZZ-K8 All the model are the same circuit and RF module, only for model name and product appearance. Regards Sincerely Client’s signature : Client’s name / title : LUO JI（Manager） Contact information / address：Tianhequ Jishanxinlujie4hao301-118 Guangzhoushi Guangdongsheng, China

Guangzhou Yayin Electronic Technology Co., Ltd (August 7, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (K-8 / K-8, K-6, K-7, K-9, K-10, K11, K12, K13, G-6, G-7, G-8, G-9, SM58 / FCC ID: 2BFZZ-K8) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. 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. Please contact me if there is any information you may need. Sincerely, Signature: Name: LUO JI Title: Manager

Guangzhou Yayin Electronic Technology Co., Ltdv (August 7, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Signature: Name: LUO JI Title: Manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 7 Model: K-8 External Photos FRQ-A Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 7 FRQ-B Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 5 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 6 of 7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 7 of 7

FCC ID LABEL: Label Location: FCC ID: 2BFZZ-K8 Model No.: K-8

Shenzhen CTB Testing Co., Ltd. FCC ID:2BFZZ-K8 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. FM: 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 SAR Exclusion threshold SAR test exclusion FM 0.6525 8.106 6.47 8±1 9.00 7.94 <5 1.28328 3.00 YES Conclusion: For the max result : 1.28328≤ FCC Limit 3.0 for 1g SAR.

ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page1of10 TestingReport CustomerName:GuangzhouYayinElectronicTechnologyCo.,Ltd ProductName:K-8 SampleModel:K-8;K-6;K-7;K-9;K-10;K11;K12;K13; G-6;G-7;G-8;G-9;SM58 ReferenceStandard:GB/T9410-2008;ANSI/IEEEStd149-1979 IssueDate:2024.8.13 Engineer:Date: Auditor:Date: Approver:Date: ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page2of10 Version VersionNo.DateDescriptionFormulateApproval A02024.8.13Forthefirsttime,formulateZkrisEason Contents 1.GeneralInformation.........................................................................................................................3 1.1Generalinformationoftestinginstitutions...........................................................................3 1.2Testingprinciple...................................................................................................................3 1.3Testequipment......................................................................................................................4 1.4Testenvironment...................................................................................................................4 1.5Statement..............................................................................................................................4 2.SampleInformation.........................................................................................................................5 2.1Clientinformation.................................................................................................................5 2.2DescriptionofEUT(S)..........................................................................................................5 2.3EUTappearance....................................................................................................................6 2.4EUTsetupphotooffreespaceOTAtesting.........................................................................6 3.TestResults.....................................................................................................................................7 3.1Teststandard.........................................................................................................................7 3.2Testuncertainty.....................................................................................................................7 3.3Testdata................................................................................................................................8 3.3.1VSWRparameters.....................................................................................................8 3.3.2VSWRdata................................................................................................................8 3.3.3Typicalfreespaceefficiencyandgain......................................................................8 3.3.4Typicalfreespaceradiationpattern...........................................................................9 （Thefollowingisblank）..............................................................................................................10 ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page3of10 1.GeneralInformation 1.1Generalinformationoftestinginstitutions Name ShenzhenRFI-LABCommunicationTechnologyCo.,Ltd. Address 103Building1TingweilndustrialPark,No.6,LiufangRoad,Zone 67Xingdong,Xin'anSubdistrict,Bao'anDistrict,Shenzhen,Guangdong,China Tel 13682621346 E-mail [email protected] Equipment Alltheequipmentusedinthereportisfixedin103Building1Tingweilndustrial Park,No.6,LiufangRoad,Zone67Xingdong,Xin'anSubdistrict,Bao'anDistrict, Shenzhen,Guangdong,China 1.2Testingprinciple ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page4of10 1.3Testequipment EquipmentModelNo.SerialNo.Manufacturer Calibration date Next calibration date OTATest System RayZone-5000 RFI-LAB-RF -D00 GTS2023.3.142025.3.13 Network Analyzer E5071C RFI-LAB-RF -D01 KEYSIGHT2023.5.112024.5.10 Network Analyzer E5071C RFI-LAB-RF -C02 KEYSIGHT2023.5.112024.5.10 1.4Testenvironment Temperature 24.1°C Humidity 58%RH Pressure 100.21kPa 1.5Statement (1)Thetestresultsinthereportareonlyapplicabletothetestedsamplesandthetestedsamples workundertheenvironmentdescribedinthereport. (2)OnlyShenzhenRFI-LABCommunicationTechnologyCo.,Ltd.havetherighttomodifythe report,andthemodificationinformationshallbeannotatedintherevisionform. (3)Anyobjectiontothisreportshallberaisedwithin30daysafterformalconfirmationofthe report. (4)Thisreportisinvalidifthereisanyevidencethatthesampleinformationprovidedisfalsified. (5)Thereportisinvalidwithoutthesignatureoftheauditorandapprover. ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page5of10 2.SampleInformation 2.1Clientinformation Name GuangzhouYayinElectronicTechnologyCo.,Ltd Address GuangdongshengGuangzhoushiTianhequJishanxinlujie4hao301-118 Contacts Mr.Xiao Tel 13538218145 E-mail [email protected] Manufacturer EnpingYaxinElectronicTechnologyCo.,Ltd 2.2DescriptionofEUT(S) ProductName K-8 SampleModel K-8;K-6;K-7;K-9;K-10;K11;K12;K13; G-6;G-7;G-8;G-9;SM58 AntennaSize / SerialNo. / AntennaType ExternalAntenna TestItem VSWR;Antennagain;Efficiency;Radiationpattern FrequencyRange 500-700MHz ReceivedDate 2024.8.12 TestDate 2024.8.12 Remark / ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page6of10 2.3EUTappearance 2.4EUTsetupphotooffreespaceOTAtesting Planform Frontview ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page7of10 3.TestResults 3.1Teststandard NameParameterMethodStandardno. Mobile communication antenna Antennagain Genericspecification forantennasusedinthe mobilecommunications GB/T 9410-2008 Radiationpattern VSWR Antenna Radiationefficiency IEEEStandardTest ProceduresforAntennas ANSI/IEEEStd 149-1979 Gainanddirectivity 3.2Testuncertainty TheuncertaintywascalculatedonthebasisoftheGUMpublishedbyISO,usingthe inclusionfactorofK=2andthe95%confidenceleveltoexpresstheextended uncertainty. ItemUncertainty VSWR±0.3 Antennagain±0.72dB Radiationefficiency±0.72dB ReportNo.:RFI-LAB-RF-202408-HH10 QP030-E41 Page8of1…

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TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: K-8 FCC ID: 2BFZZ-K8 Trademark: NXG Model Number: K-8, K-6, K-7, K-9, K-10, K11, K12, K13, G-6, G-7, G-8, G-9, SM58 Prepared For: Guangzhou Yayin Electronic Technology Co., Ltd Address: Tianhequ Jishanxinlujie4hao301-118 Guangzhoushi Guangdongsheng, China Manufacturer: Enping Yaxin Electronic Technology Co., Ltd Address: Enping City, Encheng Street, No. 152, Industrial 4th Road, comprehensive plant 2, 3-4 floors Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Jul. 16, 2024 Sample tested Date: Jul. 16, 2024 to Aug. 05, 2024 Issue Date: Aug. 05, 2024 Report No.: CTB240725113RFX Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.236 ANSI C63.10:2013 Test Results PASS Remark: This is FM radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB240725113RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 31 TABLE OF CONTENT Test Report Declaration Page 1. VERSION .......................................................................................................................................... 3 2. TEST SUMMARY ............................................................................................................................. 4 3. MEASUREMENT UNCERTAINTY ................................................................................................... 5 4. PRODUCT INFORMATION AND TEST SETUP ............................................................................. 6 4.1 Product Information ............................................................................................................................ 6 4.2 Test Setup Configuration ................................................................................................................... 6 4.3 Support Equipment ............................................................................................................................ 6 4.4 Channel List ....................................................................................................................................... 7 4.5 Test Mode .......................................................................................................................................... 7 4.6 Test Environment ............................................................................................................................... 7 5. TEST FACILITY AND TEST INSTRUMENT USED ......................................................................... 8 5.1 Test Facility ........................................................................................................................................ 8 5.2 Test Instrument Used ......................................................................................................................... 8 6. AC POWER LINE CONDUCTED EMISSION .................................................................................. 11 6.1 Block Diagram Of Test Setup ........................................................................................................... 11 6.2 Limit .................................................................................................................................................. 11 6.3 Test procedure ................................................................................................................................. 11 6.4 Test Result ....................................................................................................................................... 13 7. TRANSMITTER SPURIOUS EMISSION ........................................................................................ 15 7.1 Block Diagram Of Test Setup ........................................................................................................... 15 7.2 Limit .................................................................................................................................................. 15 7.3 Test procedure ................................................................................................................................. 16 7.4 Test Result ....................................................................................................................................... 17 8. CONDUCTED OUTPUT POWER .................................................................................................. 20 8.1 Block Diagram Of Test Setup ........................................................................................................... 20 8.2 Limit .................................................................................................................................................. 20 8.3 Test procedure ................................................................................................................................. 20 8.4 Test Result ....................................................................................................................................... 21 9. OCCUPIED BANDWIDTH ...................................................................................................…

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Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Model: K-8 Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions