2BWBA-KMIXPRO2Wireless microphone

THIENTHANHDATELECTRONICSPRODUCETRADINGJSC Address ： 32BinhLongSt.,PhuThanhWard,HoChiMinhCity,Vietnam Date: 2026-06-04 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements Part 2.911(d)(7) Filing SUBJECT: FCCApplication for FCC ID: 2BWBA-KMIXPRO2 FRN:0038468542 (“THIEN THANH DAT ELECTRONICS PRODUCE TRADING JSC”) certifies that, as ofthe date of the filing of the application, CELLT INC. is our designated U.S. agent for service of process for the above referenced FCC ID. (“THIEN THANH DAT ELECTRONICS PRODUCE TRADING JSC”) 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. CELLT INC. accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent Information: Name: CELLT INC. Address: 1401 21ST ST# 12958 SACRAMENTO, CA 95811 United States FRN：0036412567 Contact Person: Thompson Lim Tel.: (424) 347-4188 Email: [email protected] Sincerely, Signed on behalf of THIEN THANH DAT ELECTRONICS PRODUCE TRADING JSC Signed on behalf of CELLT INC. Name: NGUYEN CHONTONGName: Thompson Lim Title: CEOTitle:General Manager Date: 2026-06-04Date: 2026-06-04

Rev1/26/2023 THIENTHANHDATELECTRONICSPRODUCETRADINGJSC FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:05-27-2026 Ref:AttestationStatementsPart2.911(d)(5)(i)Filing FCCID:2BWBA-KMIXPRO2 (“THIENTHANHDATELECTRONICSPRODUCETRADINGJSC”)certifiesthattheequipmentforwhich authorizationissoughtisnot“covered”equipmentprohibitedfromreceivinganequipment authorizationpursuanttosection2.903oftheFCCrules. (“THIENTHANHDATELECTRONICSPRODUCETRADINGJSC”)certifiesthattheequipmentforwhich authorizationissoughtdoesnotincludecybersecurityoranti-virussoftwareproducedorprovidedby KasperskyLab,Inc.oranyofitssuccessorsandassignees,includingequipmentwithintegratedKaspersky Lab,Inc.(oranyofitssuccessorsandassignees)cybersecurityoranti-virussoftwarepursuanttoDA-24- 886andKDB986446D01CoveredEquipmentGuidancesectionB(2a). Deviceisinherentlycompliantbasedonhardwarelimitationsorsoftwarecontrols. or ASoftwareBillofMaterials(SBOM)isprovidedtotheTCBforreview,and Theend-userorthirdpartiescannotinstalladditionalsoftwareonthisdevice. Sincerely, (Applicantsignature)NGUYENCHONTONG (Applicantprintedname) Rev1/26/2023 THIENTHANHDATELECTRONICSPRODUCETRADINGJSC FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:05-27-2026 Ref:AttestationStatementsPart2.911(d)(5)(ii)Filing FCCID:2BWBA-KMIXPRO2 (“THIENTHANHDATELECTRONICSPRODUCETRADINGJSC”)certifiesthat,asofthedateofthefilingof theapplication,THIENTHANHDATELECTRONICSPRODUCETRADINGJSCisnotidentifiedonthe CoveredList(asaspecificallynamedentityoranyofitssubsidiariesoraffiliates)asanentityproducing “covered”equipment. Sincerely, (Applicantsignature) (Applicantprintedname)NGUYENCHONTONG

THIENTHANHDATELECTRONICSPRODUCETRADINGJSC Date：05-27-2026 Product/ModelNumber:Wirelessmicrophone/K-MixPro2,K-MixPro3, K-MiPro5,K-MixPro7,K-MixPro9 FCCID:2BWBA-KMIXPRO2 Towhomitmayconcern, Re:ProductCertificationRepresentativeAuthorizationLetter WeauthorizeQAILaboratoriesLtd.3980NorthFraserWay,BurnabyB.C. CanadaV5J5K5toactonourbehalfonallmattersconcerningtheabove namedequipment. Thisshallincludethefollowing: Testing Approvalapplicationsandprocedures WedeclarethatQAILaboratoriesLtd.isallowedtoforwardallinformation relatedtotheapprovalprojecttotheappliedcertificationbodyandtothe notificationentitiesandtodiscussanyissuesconcerningtheapproval application.AnyandallactscarriedoutbyQAILaboratoriesLtd.onour behalfshallhavethesameeffectasactsofourown. By:NGUYENCHONTONG ContactListedonFCCWesbite Title:CEO Email:[email protected] Telephone:84838608888 Onbehalfof:THIENTHANHDATELECTRONICSPRODUCETRADING JSC

THIENTHANHDATELECTRONICSPRODUCETRADINGJSC OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Date:May27,2026 Subject;RequestforConfidentiality FCCID:2BWBA-KMIXPRO2 ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,we arerequestingtheCommissiontowithholdthefollowingattachment(s)asconfidential documentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsideredas proprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthese documentsmightbeharmfultoourcompanyandwouldgivecompetitorsanunfairadvantage inthemarket. SchematicDiagram BlockDiagram PartsList OperationalDescription Tune-upProcedure SoftwareSecurityRequirementsforUNIIdevices Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketingregulations inTitle47CFR§2.803andtheimportationrulesinTitle47CFR§2.1204,whileensuringthat businesssensitiveinformationremainsconfidentialuntiltheactualmarketingofnewly authorizeddevices,werequestShortTermConfidentialityofthefollowingattachment(s); ExternalPhotos TestSetupPhotos InternalPhotos UserManual For45days,pursuanttoPublicNoticeDA04-1705. OR For180dayspursuanttoKDB726920D01. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondenceduringthecertificationreviewprocesscannotbegrantedasconfidential documentsandthisinformationwillbeavailableforpublicreviewoncethegrantofequipment authorizationisissued. Sincerely, Signature: Name:NGUYENCHONTONG Title:CEO

Label: Wirelessmicrophone Model:K-MixPro2FCCID:2BWBA-KMIXPRO2 23mm 14mm

FCC ID:2BWBA-KMIXPRO2 RF ExposureEvaluation AccordingtoKDB 447498D01 GeneralRF ExposureGuidancev06andpart2.1093 ， UnlessspecificallyrequiredbythepublishedRF exposureKDB procedures, standalone 1-gheadorbodyand10-gextremitySARevaluationforgeneralpopulationexposure conditions,bymeasurementornumericalsimulation,is notrequiredwhenthe correspondingSAR Test ExclusionThresholdcondition(s),listedbelow,is (are)satisfied. For100MHzto6 GHzandtestseparationdistances≤ 5 mm,the1-gand10-gSARtest exclusionthresholdsaredeterminedbythefollowing: [(max.powerofchannel,includingtune-uptolerance,mW)/ (min.testseparationdistance, mm)]· [√f (GHz) ] ≤ 3.0for1-gSAR,and≤ 7.5for10-gextremitySAR,where f (GHz) is theRFchanneltransmitfrequencyin GHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultis roundedtoonedecimalplaceforcomparison Here, Soa SARtestis notrequired Mode Freque ncy (MHz) Max Power (dBm) Targetpower W/tolerance (dBm) Maxtune uppower tolerance (dBm) MaxPower (mW) Min. Distance (mm) Calc. thresholds limit DQPSK 657.1 -1.251 -1.0±1.00.01.0005.000.1623.0 660.1 -2.928 -3.0±1.0-2.00.6315.000.1033.0 662.8 -3.896 -4.0±1.0 -3.00.5015.000.0823.0

Antenna type:Spring Ant FCC ID: 2BWBA-KMIXPRO2

SZNTT-TR824-0Page 1 of 37 Hotline: 0755-27889935http://www.ntt-testing.com FCC TEST REPORT FCC ID:2BWBA-KMIXPRO2 Product: Wireless microphone Model Name: K-Mix Pro 2, K-Mix Pro 3, K-Mix Pro 5, K-Mix Pro 7, K-Mix Pro 9 Brand: N/A Report No.: SZNTT26018449E1-1 Prepared for THIEN THANH DAT ELECTRONICS PRODUCE TRADING JSC 32 Binh Long St.,Phu Thanh Ward,Ho Chi Minh City, Vietnam Prepared by Shenzhen NTT Testing Technology Co.,Ltd. A101&2F B2, Fuqiao 6th Area, Xintian Community, Fuhai Street, Baoan District, Shenzhen, People’s Republic of ChinaA101&2F B2, Fuqiao 6th Area, Xintian Community, Fuhai Street, Baoan District, Shenzhen, People’s Republic of China TEL: 0755-27889935 FAX: / Report No.: SZNTT26018449E1-1 SZNTT-TR824-0Page 2 of 37 Hotline: 0755-27889935http://www.ntt-testing.com TEST RESULT CERTIFICATION Applicant’s name: THIEN THANH DAT ELECTRONICS PRODUCE TRADING JSC Address: 32 Binh Long St.,Phu Thanh Ward,Ho Chi Minh City, Vietnam. Manufacture's name : THIEN THANH DAT ELECTRONICS PRODUCE TRADING JSC Address: 32 Binh Long St.,Phu Thanh Ward,Ho Chi Minh City, Vietnam. Product name: Wireless microphone Model name: K-Mix Pro 2, K-Mix Pro 3, K-Mix Pro 5, K-Mix Pro 7, K-Mix Pro 9 Standards: FCC CFR47 Part 15 Section 15.236 Test procedure: ANSI C63.10-2020+Cor.1-2023 Date of test: Apr. 27, 2026 - May 15, 2026 Date of Issue: May 16, 2026 This device described above has been tested by NTT, and the test results showthatthe equipment under test (EUT) is in compliance with the FCC requirements. Andit is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of NTT, this document may be altered or revised by NTT, personal only, and shall be noted in the revision of the document. Prepared by(Test Engineer): Zhao Di Reviewer(Supervisor): Ken Wu Approved(Manager): Abel Yu Report No.: SZNTT26018449E1-1 SZNTT-TR824-0Page 3 of 37 Hotline: 0755-27889935http://www.ntt-testing.com Table of ContentsPage TEST RESULT CERTIFICATION...................................................................................2 1. VERSION...................................................................................................................5 2. SUMMARY OF TEST RESULTS............................................................................... 6 2.1 TEST FACILITY...............................................................................................................7 2.2 MEASUREMENT UNCERTAINTY...................................................................................7 3.GENERAL INFORMATION.........................................................................................8 3.1 GENERAL DESCRIPTION OF EUT................................................................................8 3.2 DESCRIPTION OF TEST MODES................................................................................ 10 3.3 BLOCK DIGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED............10 3.4 DESCRIPTION OF SUPPORT UNITS(CONDUCTED MODE).....................................10 3.5 EQUIPMENTS LIST FOR ALL TEST ITEMS................................................................ 11 4. EMC EMISSION TEST.............................................................................................13 4.1 CONDUCTED EMISSION MEASUREMENT.................................................................13 4.1.1 POWER LINE CONDUCTED EMISSION LIMITS.................................................13 4.1.2 TEST PROCEDURE..............................................................................................14 4.1.3 DEVIATION FROM TEST STANDARD.................................................................14 4.1.4 TEST SETUP.........................................................................................................14 4.1.5 EUT OPERATING CONDITIONS..........................................................................14 4.1.6 TEST RESULTS....................................................................................................15 4.2.1 RADIATED EMISSION LIMITS.............................................................................17 4.2.3 TEST SETUP.........................................................................................................18 4.2.4 TEST PROCEDURE..............................................................................................18 4.2.5 TEST RESULTS .................................................................................................. 18 5. MAXIMUM RADIATED POWER(EIRP)................................................................... 22 5.1 APPLIED PROCEDURES / LIMIT............................................................................22 5.2 TEST PROCEDURE.................................................................................................22 5.3 DEVIATION FROM STANDARD..............................................................................22 5.4 TEST SETUP............................................................................................................22 5.5 EUT OPERATION CONDITIONS.............................................................................22 5.6 TEST RESULTS.......................................................................................................23 6. CHANNEL BANDWIDTH.................................................................................... 25 7. NECESSARY BANDWIDTH....................................................................................28 7.1 LIMIT..............................................................................................................................28 7.2 TEST SETUP.................................................................................................................29 Report No.: SZNTT26018449E1-1 SZNTT-TR824-0Page 4 of 37 Hotline: 0755-27889935http://www.ntt-testing.com Table of ContentsPage 7.3 TEST PROCEDURE.......................…

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