SD4-MTD421-B2In-vehicle Multimedia Host

BYDAutoIndustryCompanyLimited CoveredEquipmentCertificationAttestationLetter 2026-01-08 NemkoNorthAmerica,Inc. 303RiverRoad Ottawa K1V1H2 Canada ATTN.:ReviewingEngineer FCCID:SD4-MTD421-B2 BYDAutoIndustryCompanyLimited(“theapplicant”)certifiesthattheequipmentfor whichauthorizationissoughtisnot“covered”equipmentprohibitedfromreceivingan equipmentauthorizationpursuanttosection2.903oftheFCCrules. Note:Iftheequipmentforwhichtheapplicantseeksauthorizationisproducedby anyoftheentitiesidentifiedonthecurrentCoveredList,theapplicantshould includeanexplanationonwhytheequipmentisnot“covered”equipment. BYDAutoIndustryCompanyLimited(“theapplicant”)certifiesthat,asofthedateofthe filingoftheapplication,theapplicantisnotidentifiedontheCoveredListasanentity producing“covered”equipment. BYDAutoIndustryCompanyLimited(“theapplicant”)certifiesthattheequipmentfor whichauthorizationissoughtdoesnotincludecybersecurityoranti-virussoftware producedorprovidedbyKasperskyLab,Inc.oranyofitssuccessorsandassignees, includingequipmentwithintegratedKasperskyLab,Inc.(oranyofitssuccessorsand assignees)cybersecurityoranti-virussoftwarepursuantto DA-24-886andKDB986446 D01 CoveredEquipmentGuidancesectionB(2a). Signed: Printedname:Gongliquan Title:Engineer CompanyName:BYDAutoIndustryCompanyLimited Address:No.3001,3007,HengPingRoad,Pingshan,Shenzhen,Guangdong,P.R. China Phone:13980278051 E-Mail:[email protected] Date:2026-01-08

1/1 US Agent for Service of Process LETTER 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: FCC US Agent, LLC FRN: 0033402884 Contact Name: Tim Payne Address: 3722 Illinois Avenue, Saint Charles, IL, 60174, USA Telephone No: 708-571-3148 Email: [email protected] Applicant: Company name: BYD Auto Industry Company Limited Product Description: Grantee code: SD4 FCC ID: SD4-MTD421-B2 FRN：0022593115 Contact Name: Gong liquan Address: No.3001, 3007, HengPing Road, Pingshan, Shenzhen, Guangdong, P.R. China Telephone No: Email: [email protected] BYD Auto Industry Company Limited certifies that, as of the date of this filing of the application with the TCB, [FCC US Agent, LLC] is our designated US agent for service of process for the above referenced FCC ID. BYD Auto Industry Company Limited 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. [FCC US Agent, 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 Applicant 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. Date: 2026-01-08 Applicant’s Name: Gong liquan US Agent’s Name: Tim Payne Title: EngineerTitle: Manager S ignature ： S ignature

BYDAutoIndustryCompanyLimited 2026-01-08 NemkoNorthAmerica,Inc. 303RiverRoad Ottawa,Ontario,Canada K1V1H2 AUTHORITYTOACTASAGENT-FCC Onourbehalf,Iappoint DamonHu, GuangdongDongdianTestingServiceCo.,Ltd.(Unit2,Building 1,No.17,Zongbu2ndRoad,SongshanLakePark,Dongguan,Guangdong,China,523808),toact asouragentinthepreparationofthisapplicationforequipmentcertification.Icertifythatsubmitted documentsproperlydescribethedeviceorsystemforwhichequipmentcertificationissought.Ialso certifythateachunitmanufactured,importedormarketed,asdefinedinFCCregulationswillhave affixedtoitalabelidenticaltothatsubmittedforapprovalwiththisapplication. Insigningthisletter,Applicantcertifiesthatneithertheapplicantnoranypartytotheapplicationis notsubjecttoadenialofFederalbenefits,thatincludeFCCbenefits,pursuanttoSection5301ofthe Anti-DrugAbuseActof1988,21U.S.C.§862becauseofaconvictionforpossessionordistribution ofacontrolledsubstance.See47CFR1.2002(b)forthedefinitionofa"party"forthesepurposes. Forinstanceswhereourauthorizedagentsignstheapplicationforcertificationonourbehalf,I acknowledgethatallresponsibilityforcomplyingwiththetermsandconditionsforcertification,as specifiedbyNemkoNorthAmericaInc.,stillresides stillresideswithus. Sincerely, Printedname:Gongliquan Title:Engineer CompanyName:BYDAutoIndustryCompanyLimited Address:No.3001,3007,HengPingRoad,Pingshan,Shenzhen,Guangdong,P.R.China Phone:13980278051 E-Mail:[email protected] Date:2026-01-08

BYDAutoIndustryCompanyLimited 2026-01-08 NemkoNorthAmerica,Inc. 303RiverRoad Ottawa,Ontario,Canada K1V1H2 REQUESTFORCONFIDENTIALITY–FCC FCCID: SD4-MTD421-B2 PursuanttoSections0.457(d)and0.459oftheCommission’sRulesand FCCGuidancedocument 726920 ,weherebyrequestpermanentconfidentialtreatmentofexhibitsidentifiedassuchinthe tablebelowandrequesttheyarepermanentlywithheldfrompublicreviewbasedonthedocuments containingtradesecretsandproprietaryinformationnotcustomarilyreleasedtothepublic.The publicdisclosureofthisinformationmightbeharmfultotheapplicantandprovideunjustifiedbenefits toitscompetitors. Wealsorequestshort-termconfidentialityoncertainexhibitsuntiltheintendeddateofmarketingas outlinedbelow.Werequesttheexhibitsbewithheldfrompublicviewforaperiodof180days.We attestmarketingoftheproductwillonlycommenceaftertheperiodofshort-termconfidentiality expires,orifmarketingistocommencebeforetherequestednumberofdayslistedabove,the granteewillinformNemkotoreleasetheShort-TermConfidentialityinformationwithheldontheFCC equipmentauthorizationwebsite. ExhibitTypeofConfidentialityRequested BlockDiagrams ☒Permanent ☐ShortTerm ExternalPhotos------------------☒ShortTerm InternalPhotos☐Permanent*☒ShortTerm OperationDescription ☒Permanent ☐ ShortTerm PartsList&Placement/BOM ☐Permanent ☐ ShortTerm Tune-UpProcedure☐Permanent ☐ShortTerm SchematicDiagrams☒Permanent ☐ShortTerm TestSetupPhotos------------------☒ShortTerm User’sManual ☐Permanent* ☒ShortTerm Theasteriskeditems(*)requirefurtherinformationtobeprovidedinthisjustificationletterbeforepermanentconfidentialitywillbe extendedtotheseexhibits.PleaserefertoFCCKDB726920D01foundat: https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=41731andreviewsectionII,3)regardingspecific informationthatmustaccompanytheserequests. Note:anydocumentsheldundertheShort-Termconfidentialitywillautomaticallybecomepublicafterthe requestedtimeifanappropriateextensionrequesthasnotbeenreceived.Anyexhibits(i.e.,schematic diagrams)thatmayhavealreadybeenrequestedtohave“Permanent”confidentialityasshownabove neednotberepeatedunderShort-Termconfidentialityrequest. Sincerely, Signed : Printedname:Gongliquan Title:Engineer CompanyName:BYDAutoIndustryCompanyLimited Address:No.3001,3007,HengPingRoad,Pingshan,Shenzhen,Guangdong,P.R.China Phone:13980278051 E-Mail:[email protected] Date:2026-01-08

位置示意： BYD Product name：In-vehicle Multimedia Host Model no.：MTD421-B2 Power supply：12V FCC ID:SD4-MTD421-B2 BYD Auto Industry Company Limited No. 3001, 3007, Hengping Road, Pingshan, Shenzhen, P. R. China Made in China ANATEL: XXXXX-XX-XXXXX Approved by PTA TAC NO:XXXXXXXXX Trade name高度：至 少1mm

Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E12 TRF No.: RT-4-E-006Page 1 of 8 RF EXPOSURE REPORT Applicant : BYD Auto Industry Company Limited Address of Applicant : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Manufacturer : BYD Auto Industry Company Limited Address of Manufacturer : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Equipment under Test : In-vehicle Multimedia Host Model No. : MTD421-B2 FCC ID : SD4-MTD421-B2 Test Standard(s) : KDB447498 D01 General RF Exposure Guidance v06 Report No. : DDT-RE25060926-1E12 Issue Date : 2026/04/02 Issue By : Guangdong Dongdian Testing Service Co., Ltd. Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E12 TRF No.: RT-4-E-006Page 2 of 8 Table of Contents 1.General Test Information..............................................................................................5 1.1.Description of EUT .......................................................................................................5 1.2.Accessories of EUT......................................................................................................6 1.3.Accessories of EUT......................................................................................................6 1.4.Test laboratory .............................................................................................................6 2.RF Exposure evaluation for FCC .................................................................................7 2.1.Assessment procedure.................................................................................................7 2.2.Assess result ................................................................................................................8 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E12 TRF:RT-4-E-006Page 3 of 8 $!CeMetaLims!digital$ Test Report Declare Applicant : BYD Auto Industry Company Limited Address of Applicant : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Equipment under Test : In-vehicle Multimedia Host Model No. : MTD421-B2 Manufacturer : BYD Auto Industry Company Limited Address of Manufacturer : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Test Standard Used: KDB447498 D01 General RF Exposure Guidance v06 We Declare: The equipment described above is tested by Guangdong Dongdian Testing Service Co., Ltd. and in the configuration tested the equipment complied with the standards specified above. The test results are contained in this test report and Guangdong Dongdian Testing Service Co., Ltd. is assumed of full responsibility for the accuracy and completeness of these tests. Report No.:DDT-RE25060926-1E12 Date of Receipt:2025/08/13Date of Test:2025/08/19~2026/02/12 Note: This report applies to above tested sample only. This report shall not be reproduced in parts without written approval of Guangdong Dongdian Testing Service Co., Ltd. Created: Jacky HuangReviewed: Johnson HuangApproved: Ella Gong 2026/01/062026/04/022026/04/02 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E12 TRF:RT-4-E-006Page 4 of 8 Revision History VersionRevision ContentIssue DateApproved V0Initial issue2026/04/02Ella Gong Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E12 TRF:RT-4-E-006Page 5 of 8 1. General Test Information 1.1. Description of EUT EUT Name:In-vehicle Multimedia Host Model Number:MTD421-B2 EUT Function Description:Please reference user manual of this device Power Supply:DC 12V Antenna Type:External antenna Max Antenna Gain (dBi): 2.4G band: 3.78 5G band: 3.56 Bluetooth Radio Specification:Bluetooth BR/EDR/LE Operation Channel Frequency:2402 MHz to 2480 MHz Modulation:GFSK Rate:1 Mbps, 2 Mbps, 3 Mbps 2.4G WIFI Radio Technology:IEEE 802.11b/g/n/ax Operation Channel Frequency: IEEE 802.11b: 2412MHz to 2462MHz IEEE 802.11g: 2412MHz to 2462MHz IEEE 802.11n HT20: 2412MHz to 2462MHz IEEE 802.11n HT40: 2422MHz to 2452MHz IEEE 802.11ax HE20: 2412MHz to 2462MHz Modulation: IEEE 802.11b: DSSS (CCK, DQPSK, DBPSK) IEEE 802.11g: OFDM (64QAM, 16QAM, QPSK, BPSK) IEEE 802.11n: OFDM (64QAM, 16QAM, QPSK, BPSK) IEEE 802.11ax: OFDM, OFDMA (1024QAM, 256QAM, 64QAM, 16QAM, QPSK, BPSK) 5G WIFI Radio Technology:IEEE 802.11a/n/ac/ax Operation Channel Frequency: U-NII-1: 5180 MHz to 5240 MHz U-NII-2A: 5260 MHz to 5320 MHz U-NII-2C: 5500 MHz to 5720 MHz U-NIl-3: 5745 MHz to 5825 MHz Modulation: IEEE 802.11a: OFDM (64QAM, 16QAM, QPSK, BPSK) IEEE 802.11n: OFDM (64QAM, 16QAM, QPSK, BPSK) IEEE 802.11ac: OFDM (256QAM, 64QAM, 16QAM, QPSK, BPSK) IEEE 802.11ax: OFDM, OFDMA (1024QAM,256QAM, 64QAM, 16QAM, QPSK, BPSK) DFS Function:Slave without DFS detection Note: The above EUT information is declared by manufacturer and for more detailed features description please refer to the manufacturer's specifications or User's Manual. Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E12 TRF:RT-4-E-006Page 6 of 8 1.2. Accessories of EUT AccessoriesManufacturerModel numberDescription //// 1.3. Accessories of EUT AccessoriesManufacturerModel numberDescription Connecting cableN/AN/Alength: 2.0m, unshielded Power cableN/AN/Alength: 2.0m, unshielded Display cableN/AN/Alength: 2.0m, shielded Bluetooth/WIFI antennaN/AN/Alength: 2.00m, shielded 1.4. Test laboratory Guangdong Dongdian Testing Service Co., Ltd. Add.: Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808. Tel.: +86-0769-38826678, http://www.dgddt.com, Email: [email protected]. CNAS Accreditation No. L6451; A2LA Accreditation Number: 3870.01 FCC Designation Number: CN1182, Test Firm Registration Number: 540522 Innovation, Science and Economic Development Canada Site Registration Number: 10288A Conformity Assessment Body identifier: CN0048 VCCI facility registration number: C-20087, T-20…

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Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF: RT-4-E-005Page 1 of 112 FCC CERTIFICATION TEST REPORT Applicant : BYD Auto Industry Company Limited Address of Applicant : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Manufacturer : BYD Auto Industry Company Limited Address of Manufacturer : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Equipment under Test : In-vehicle Multimedia Host Model No. : MTD421-B2 FCC ID : SD4-MTD421-B2 Test Standard(s) : FCC Rules and Regulations Part 15 Subpart C, ANSI C63.10-2020 Report No. : DDT-RE25060926-1E09 Issue Date : 2026/04/02 Issue By : Guangdong Dongdian Testing Service Co., Ltd. Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF: RT-4-E-005Page 2 of 112 Table of Contents 1.Summary of Test Results .............................................................................................7 2.General Test Information..............................................................................................8 2.1.Description of EUT .......................................................................................................8 2.2.Accessories of EUT......................................................................................................9 2.3.Block diagram of EUT configuration for test.................................................................9 2.4.Decision of final test mode .........................................................................................10 2.5.Deviations of test standard.........................................................................................10 2.6.Test environment conditions ......................................................................................10 2.7.Test laboratory ...........................................................................................................11 2.8.Measurement uncertainty...........................................................................................11 3.Equipment Used During Conductive Test ..................................................................12 4.6 dB Bandwidth ..........................................................................................................13 4.1.Block diagram of test setup ........................................................................................13 4.2.Limits ..........................................................................................................................13 4.3.Test procedure ...........................................................................................................13 4.4.Test result...................................................................................................................14 4.5.Test graphs ................................................................................................................15 5.99% Bandwidth ..........................................................................................................17 5.1.Block diagram of test setup ........................................................................................17 5.2.Limits ..........................................................................................................................17 5.3.Test procedure ...........................................................................................................17 5.4.Test result...................................................................................................................18 5.5.Test graphs ................................................................................................................19 6.Maximum Peak Output Power....................................................................................21 6.1.Block diagram of test setup ........................................................................................21 6.2.Limits ..........................................................................................................................21 6.3.Test procedure ...........................................................................................................21 6.4.Test result...................................................................................................................22 6.5.Test graphs ................................................................................................................23 7.Power Spectral Density ..............................................................................................27 7.1.Block diagram of test setup ........................................................................................27 7.2.Limits ..........................................................................................................................27 7.3.Test procedure ...........................................................................................................27 7.4.Test result...................................................................................................................28 7.5.Test graphs ................................................................................................................29 8.Band Edge Compliance (Conducted Method)............................................................33 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF: RT-4-E-005Page 3 of 112 8.1.Block diagram of test setup ........................................................................................33 8.2.Limits ..........................................................................................................................33 8.3.Test procedure ...........................................................................................................33 8.4.Test result.........................................…

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Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF:RT-4-E-005Page 61 of 112 TR-4-E-009 Radiated Emission Test Result Test Date:2025-08-27Tested By:Nan Zhong EUT:In-vehicle Multimedia HostModel Number:MTD421-B2 Test Mode:TX BLE2M 2404MHz ModePower Supply:DC 12V Condition:Temp:22.2°C;Humi:56.2%Test Site:DDT 3# Chamber File Path:d:\ts\2025 report date\Q25060926-1E\FCC BELOW1G\6 Memo:Sample Number:S25060926-001 Final Data List NO. Freq. [MHz] Reading [dBμV/m] Antenna Factor [dB] Cable Loss [dB] Result [dBμV/m] Limit [dBμV/m] Margin [dB] DetectorPolarity 153.23731.4713.253.9016.3240.0023.68QPVertical 294.07636.9210.294.1519.0643.5024.44QPVertical 3130.98243.858.714.2824.5143.5018.99QPVertical 4139.41637.718.234.3017.9043.5025.60QPVertical 5299.38835.1413.565.1421.4446.0024.56QPVertical 6411.60831.1815.265.6019.5346.0026.47QPVertical Note: 1. Result Level = Reading + Cable loss + Antenna Factor + AMP 2. If Peak Result complies with QP limit, QP Result is deemed to comply with QP limit. 3. Test setup: RBW: 120 kHz, VBW: 300 kHz, Sweep time: auto. Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF:RT-4-E-005Page 62 of 112 PCB A: TR-4-E-009 Radiated Emission Test Result Test Date:2025-08-27Tested By:Nan Zhong EUT:In-vehicle Multimedia HostModel Number:MTD421-B2 Test Mode:TX BLE2M 2404MHz ModePower Supply:DC 12V Condition:Temp:22.2°C;Humi:56.2%Test Site:DDT 3# Chamber File Path:d:\ts\2025 report date\Q25060926-1E\FCC BELOW1G\11 Memo:Sample Number:S25060926-001 Final Data List NO. Freq. [MHz] Reading [dBμV/m] Antenna Factor [dB] Cable Loss [dB] Result [dBμV/m] Limit [dBμV/m] Margin [dB] DetectorPolarity 193.55032.4910.214.1414.5443.5028.96QPHorizontal 2131.07436.548.704.2817.1943.5026.31QPHorizontal 3224.58635.9811.484.6319.6946.0026.31QPHorizontal 4299.59838.6513.585.1424.9746.0021.03QPHorizontal 5336.81638.0714.265.2925.1846.0020.82QPHorizontal 6561.54533.2118.216.1424.8146.0021.19QPHorizontal Note: 1. Result Level = Reading + Cable loss + Antenna Factor + AMP 2. If Peak Result complies with QP limit, QP Result is deemed to comply with QP limit. 3. Test setup: RBW: 120 kHz, VBW: 300 kHz, Sweep time: auto. Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF:RT-4-E-005Page 63 of 112 TR-4-E-009 Radiated Emission Test Result Test Date:2025-08-27Tested By:Nan Zhong EUT:In-vehicle Multimedia HostModel Number:MTD421-B2 Test Mode:TX BLE2M 2404MHz ModePower Supply:DC 12V Condition:Temp:22.2°C;Humi:56.2%Test Site:DDT 3# Chamber File Path:d:\ts\2025 report date\Q25060926-1E\FCC BELOW1G\12 Memo:Sample Number:S25060926-001 Final Data List NO. Freq. [MHz] Reading [dBμV/m] Antenna Factor [dB] Cable Loss [dB] Result [dBμV/m] Limit [dBμV/m] Margin [dB] DetectorPolarity 193.48536.4110.204.1418.4543.5025.05QPVertical 2131.07444.58.704.2825.1543.5018.35QPVertical 3187.15834.799.514.4316.3443.5027.16QPVertical 4299.38832.8913.565.1419.1946.0026.81QPVertical 5374.43437.1114.895.4524.9846.0021.02QPVertical 6561.54531.5618.216.1423.1646.0022.84QPVertical Note: 1. Result Level = Reading + Cable loss + Antenna Factor + AMP 2. If Peak Result complies with QP limit, QP Result is deemed to comply with QP limit. 3. Test setup: RBW: 120 kHz, VBW: 300 kHz, Sweep time: auto. Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF:RT-4-E-005Page 64 of 112 TR-4-E-009 Radiated Emission Test Result Test Date:2025-08-27Tested By:Nan Zhong EUT:In-vehicle Multimedia HostModel Number:MTD421-B2 Test Mode:TX BLE1M 2402MHz ModePower Supply:DC 12V Condition:Temp:22.2°C;Humi:56.2%Test Site:DDT 3# Chamber File Path:d:\ts\2025 report date\Q25060926-1E\FCC BELOW1G\13 Memo:Sample Number:S25060926-001 Final Data List NO. Freq. [MHz] Reading [dBμV/m] Antenna Factor [dB] Cable Loss [dB] Result [dBμV/m] Limit [dBμV/m] Margin [dB] DetectorPolarity 1130.98236.238.714.2816.8943.5026.61QPHorizontal 2187.15838.239.514.4319.7843.5023.72QPHorizontal 3224.58636.8511.484.6320.5646.0025.44QPHorizontal 4299.59839.2513.585.1425.5746.0020.43QPHorizontal 5337.05240.6714.265.3027.7946.0018.21QPHorizontal 6561.54534.3318.216.1425.9346.0020.07QPHorizontal Note: 1. Result Level = Reading + Cable loss + Antenna Factor + AMP 2. If Peak Result complies with QP limit, QP Result is deemed to comply with QP limit. 3. Test setup: RBW: 120 kHz, VBW: 300 kHz, Sweep time: auto. Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF:RT-4-E-005Page 65 of 112 TR-4-E-009 Radiated Emission Test Result Test Date:2025-08-27Tested By:Nan Zhong EUT:In-vehicle Multimedia HostModel Number:MTD421-B2 Test Mode:TX BLE1M 2402MHz ModePower Supply:DC 12V Condition:Temp:22.2°C;Humi:56.2%Test Site:DDT 3# Chamber File Path:d:\ts\2025 report date\Q25060926-1E\FCC BELOW1G\14 Memo:Sample Number:S25060926-001 Final Data List NO. Freq. [MHz] Reading [dBμV/m] Antenna Factor [dB] Cable Loss [dB] Result [dBμV/m] Limit [dBμV/m] Margin [dB] DetectorPolarity 153.16230.413.233.9015.2340.0024.77QPVertical 293.48537.3610.204.1419.4043.5024.10QPVertical 3130.98245.368.714.2826.0243.5017.48QPVertical 4168.47434.799.144.3815.9443.5027.56QPVertical 5299.38834.7813.565.1421.0846.0024.92QPVertical 6411.89733.715.285.6022.0746.0023.93QPVertical Note: 1. Result Level = Reading + Cable loss + Antenna Factor + AMP 2. If Peak Result complies with QP limit, QP Result is deemed to comply with QP limit. 3. Test setup: RBW: 120 kHz, VBW: 300 kHz, Sweep time: auto. Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E09 TRF:RT-4-E-005Page 66 of 112 PCB B: TR-4-E-009 Radiated Emission Test Result Test Date:2025-08-27Tested By:Nan Zhong EUT:In-vehicle Multimedia HostModel Number:MTD421-B2 Test Mode:TX BLE1M 2480MHz ModePower Supply:DC 12V Condition:Temp:22.2°C;Humi:56.2%Test Site:DDT 3# Chamber File Path:d:\ts\2025 report date\Q25060926-1E\FCC ABOVE1G BLE\21 Memo:Sample Number:S25060926-001 Power Setting:NA Suspected Data List NO. Freq. [MHz] Reading [dBμV/m] Antenna Factor […

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Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E10 TRF: RT-4-E-005Page 1 of 203 FCC AND ISED CERTIFICATION TEST REPORT Applicant : BYD Auto Industry Company Limited Address of Applicant : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Manufacturer : BYD Auto Industry Company Limited Address of Manufacturer : No. 3001, 3007 HengPing Road, Pingshan, Shenzhen, P.R. China Equipment under Test : In-vehicle Multimedia Host Model No. : MTD421-B2 FCC ID : SD4-MTD421-B2 Test Standard(s) : FCC Rules and Regulations Part 15 Subpart C, ANSI C63.10-2020 Report No. : DDT-RE25060926-1E10 Issue Date : 2026/04/02 Issue By : Guangdong Dongdian Testing Service Co., Ltd. Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE25060926-1E10 TRF: RT-4-E-005Page 2 of 203 Table of Contents 1.Summary of Test Results .............................................................................................7 2.General Test Information..............................................................................................8 2.1.Description of EUT .......................................................................................................8 2.2.Accessories of EUT......................................................................................................8 2.3.Block diagram of EUT configuration for test.................................................................9 2.4.Decision of final test mode ...........................................................................................9 2.5.Deviations of test standard.........................................................................................10 2.6.Test environment conditions ......................................................................................10 2.7.Test laboratory ...........................................................................................................10 2.8.Measurement uncertainty...........................................................................................11 3.Equipment Used During Conductive Test ..................................................................12 4.6dB Bandwidth ...........................................................................................................13 4.1.Block diagram of test setup ........................................................................................13 4.2.Limits ..........................................................................................................................13 4.3.Test procedure ...........................................................................................................13 4.4.Test result...................................................................................................................14 4.5.Test graphs ................................................................................................................16 5.99% Bandwidth ..........................................................................................................28 5.1.Block diagram of test setup ........................................................................................28 5.2.Limits ..........................................................................................................................28 5.3.Test procedure ...........................................................................................................28 5.4.Test result...................................................................................................................29 5.5.Test graphs ................................................................................................................30 6.Conducted Output Power ...........................................................................................43 6.1.Block diagram of test setup ........................................................................................43 6.2.Limits ..........................................................................................................................43 6.3.Test procedure ...........................................................................................................43 6.4.Test result average.....................................................................................................44 7.Power Spectral Density ..............................................................................................47 7.1.Block diagram of test setup ........................................................................................47 7.2.Limits ..............…

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