1. FCC ID
  2. SD4
  3. SD4-MTD421-B2

FCC ID SD4-MTD421-B2

In-vehicle Multimedia Host

by BYD Auto Industry Company Limited

Grantee Code: SD4   Product Code: MTD421B2
Latest application date: 2026-04-09

FCC ID Device Details

FCC IDSD4-MTD421-B2
Mirrorsfcc.id | gov | fccid.ai
Grantee CodeSD4
Product CodeMTD421B2
Applicant BusinessBYD Auto Industry Company Limited 🇨🇳
Related Domains byd.com fccusagent.com
Equipment ClassIn-vehicle Multimedia Host
Test FirmGuangdong Dongdian Testing Service Co., Ltd.

Operating Frequencies

Frequency RangeApplication PurposeFinal Action Date
2402-2480 MHzOriginal Equipment2026-04-09
2412-2462 MHzOriginal Equipment2026-04-09
5745-5825 MHzOriginal Equipment2026-04-09

Exhibits

DocumentTypeAvailableFile
Label and LocationID Label/Location Info2026-04-09PDF 233.9 KB
Antenna SpecificationTest Report2026-04-09PDF 575.8 KB
Test Report BLE Part 1Test Report2026-04-09PDF 2.7 MB
Test Report BLE Part 2Test Report2026-04-09PDF 4.5 MB
Test Report Part 1Test Report2026-04-09PDF 5.3 MB
Test Report Part 1Test Report2026-04-09PDF 3 MB
Test Report Part 10Test Report2026-04-09PDF 5.2 MB
Test Report Part 11Test Report2026-04-09PDF 5.3 MB
Test Report Part 12Test Report2026-04-09PDF 5.3 MB
Test Report Part 13Test Report2026-04-09PDF 5.2 MB
Test Report Part 14Test Report2026-04-09PDF 4.7 MB
Test Report Part 15Test Report2026-04-09PDF 4.3 MB
Test Report Part 2Test Report2026-04-09PDF 4.5 MB
Test Report Part 2Test Report2026-04-09PDF 4.9 MB
Test Report Part 3Test Report2026-04-09PDF 5 MB
Test Report Part 4Test Report2026-04-09PDF 4.1 MB
Test Report Part 5Test Report2026-04-09PDF 4.6 MB
Test Report Part 6Test Report2026-04-09PDF 4.6 MB
Test Report Part 7Test Report2026-04-09PDF 5.4 MB
Test Report Part 8Test Report2026-04-09PDF 5 MB
Test Report Part 9Test Report2026-04-09PDF 5 MB
Test Report WIFI Part 1Test Report2026-04-09PDF 4.8 MB
Test Report WIFI Part 2Test Report2026-04-09PDF 5.4 MB
Test Report WIFI Part 3Test Report2026-04-09PDF 5.4 MB
Test Report WIFI Part 4Test Report2026-04-09PDF 4.8 MB
Test Report WIFI Part 5Test Report2026-04-09PDF 2.1 MB
Software Security InformationCover Letter(s)2026-04-09PDF 95.1 KB
Covered Equipment AttestationAttestation Statements2026-04-09PDF 70.7 KB
U.S. Agent Designation AttestationAttestation Statements2026-04-09PDF 145.9 KB
Agent Authorization LetterCover Letter(s)2026-04-09PDF 62.9 KB
Confidentiality LetterCover Letter(s)2026-04-09PDF 98.3 KB
RF Exposure EvaluationRF Exposure Info2026-04-09PDF 807.1 KB
Users Manual Metadata onlyUsers Manual2026-10-05PDF 468.9 KB
Internal Photos Metadata onlyInternal Photos2026-10-05PDF 5.1 MB
External Photos Metadata onlyExternal Photos2026-10-05PDF 1.8 MB
Test Setup Photos Metadata onlyTest Setup Photos2026-10-05PDF 4.1 MB
Block Diagram Metadata onlyBlock DiagramPDF 152.8 KB
Schematics Metadata onlySchematicsPDF 2 MB
Operational Description Metadata onlyOperational DescriptionPDF 136.4 KB

Application Information

Application IDlZooPnIiKG2MYniY4lhUTg==
Final Action Date2026-04-09
Application PurposeOriginal Equipment
Applicant FRN0022593115
ModelMTD421-B2
Frequency Range2402-2480 MHz
Equipment ClassDSS - Part 15 Spread Spectrum Transmitter
Device DescriptionIn-vehicle Multimedia Host
Responsible PartyGong liquan, gong.liquan@byd.com , 13980278051
Technical ContactDamon Hu, Guangdong Dongdian Testing Service Co., Ltd, Damon_Hu@dgddt.com , +86076938826678
Non-Technical ContactTim Payne, FCC US Agent, LLC, Support@FCCUSAgent.com , 7085713148
Test FirmMr. Jamy Yu, Guangdong Dongdian Testing Service Co., Ltd., jamy@dgddt.com , +86-0769-89201646
TCB EmailTCB@nemko.com
TCB ScopeA4: UNII devices & low power transmitters using spread spectrum techniques
Short-Term ConfidentialityYes
Long-Term ConfidentialityYes
Modular EquipmentDoes not apply
Composite DeviceYes
Cognitive RadioNo
Authorization WaiverNo
Authorization Waiver ApprovedNo
Section 5301 CertificationYes
Related OET Knowledge DataBase InquiryNo

Applications

Application IDDatePurpose
lZooPnIiKG2MYniY4lhUTg==2026-04-09Original Equipment
ZCXrXsU8sB5cEBgsfnf7Fg==2026-04-09Original Equipment
FeljtnpfnBQi77ZpaV/jEQ==2026-04-09Original Equipment

Equipment Authorization

FrequencyOutputRulesGrant Notes
2402-2480 MHz0.0039815CCC
2412-2462 MHz0.0215CCC
2402-2480 MHz0.0105915CCC
5180-5240 MHz0.0484215ECC
5260-5320 MHz0.0657715ECC ND
5500-5720 MHz0.0997715ECC ND
5745-5825 MHz0.0579415ECC

Grants

TCB Grant - Application ZCXrXsU8sB5cEBgsfnf7Fg==

TCB GRANT OF EQUIPMENT
AUTHORIZATION		 TCB
Certification
Issued Under the Authority of the
Federal Communications Commission
By:

  Nemko North America, Inc.
303 River Road
Ottawa, Ontario, K1V 1H2
Canada 		Date of Grant: 04/09/2026

Application Dated: 04/08/2026
BYD Auto Industry Company Limited
No. 3001, 3007, Hengping Road, Pingshan,
Shenzhen, 518118
China
 
Attention: Gong liquan , Engineer

NOT TRANSFERABLE
EQUIPMENT AUTHORIZATION is hereby issued to the named GRANTEE, and is VALID ONLY for the equipment identified hereon for use under the Commission's Rules and Regulations listed below.
 
FCC IDENTIFIER:  SD4-MTD421-B2
Name of Grantee:  BYD Auto Industry Company Limited
Equipment Class: Digital Transmission System
Notes: In-vehicle Multimedia Host
Grant Notes  FCC Rule Parts Frequency
Range (MHZ) 		Output
Watts 		Frequency
Tolerance 		Emission
Designator
CC 15C 2402.0  -  2480.0 0.00398  
CC 15C 2412.0  -  2462.0 0.02  

Output power listed is conducted. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter, except in accordance with FCC multi-transmitter product procedures. End-users and installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance.

CC: This device is certified pursuant to two different Part 15 rules sections.

TCB Grant - Application lZooPnIiKG2MYniY4lhUTg==

TCB GRANT OF EQUIPMENT
AUTHORIZATION		 TCB
Certification
Issued Under the Authority of the
Federal Communications Commission
By:

  Nemko North America, Inc.
303 River Road
Ottawa, Ontario, K1V 1H2
Canada 		Date of Grant: 04/09/2026

Application Dated: 04/08/2026
BYD Auto Industry Company Limited
No. 3001, 3007, Hengping Road, Pingshan,
Shenzhen, 518118
China
 
Attention: Gong liquan , Engineer

NOT TRANSFERABLE
EQUIPMENT AUTHORIZATION is hereby issued to the named GRANTEE, and is VALID ONLY for the equipment identified hereon for use under the Commission's Rules and Regulations listed below.
 
FCC IDENTIFIER:  SD4-MTD421-B2
Name of Grantee:  BYD Auto Industry Company Limited
Equipment Class: Part 15 Spread Spectrum Transmitter
Notes: In-vehicle Multimedia Host
Grant Notes  FCC Rule Parts Frequency
Range (MHZ) 		Output
Watts 		Frequency
Tolerance 		Emission
Designator
CC 15C 2402.0  -  2480.0 0.01059  

Output power listed is conducted. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter, except in accordance with FCC multi-transmitter product procedures. End-users and installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance.

CC: This device is certified pursuant to two different Part 15 rules sections.

TCB Grant - Application FeljtnpfnBQi77ZpaV/jEQ==

TCB GRANT OF EQUIPMENT
AUTHORIZATION		 TCB
Certification
Issued Under the Authority of the
Federal Communications Commission
By:

  Nemko North America, Inc.
303 River Road
Ottawa, Ontario, K1V 1H2
Canada 		Date of Grant: 04/09/2026

Application Dated: 04/08/2026
BYD Auto Industry Company Limited
No. 3001, 3007, Hengping Road, Pingshan,
Shenzhen, 518118
China
 
Attention: Gong liquan , Engineer

NOT TRANSFERABLE
EQUIPMENT AUTHORIZATION is hereby issued to the named GRANTEE, and is VALID ONLY for the equipment identified hereon for use under the Commission's Rules and Regulations listed below.
 
FCC IDENTIFIER:  SD4-MTD421-B2
Name of Grantee:  BYD Auto Industry Company Limited
Equipment Class: Unlicensed National Information Infrastructure TX
Notes: In-vehicle Multimedia Host
Grant Notes  FCC Rule Parts Frequency
Range (MHZ) 		Output
Watts 		Frequency
Tolerance 		Emission
Designator
CC 15E 5180.0  -  5240.0 0.04842  
CC ND 15E 5260.0  -  5320.0 0.06577  
CC ND 15E 5500.0  -  5720.0 0.09977  
CC 15E 5745.0  -  5825.0 0.05794  

Output power listed is conducted. This device supports 20, 40 and 80 MHz bandwidth modes. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter, except in accordance with FCC multi-transmitter product procedures. End-users and installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance.

CC: This device is certified pursuant to two different Part 15 rules sections.
ND: This UNII device complies with the Transmit Power Control (TPC) and Dynamic Frequency Selection (DFS) requirements in Section 15.407(h).