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GROM Audio MST4 integration kit for Mercedes Benz

USB / iPod / Android / Bluetooth Interface Box

USB / iPod / Android / Bluetooth Interface Box
USB port accepting any USB stick/drive
MP3, M4A, OGG, FLAC, AAC, WAV music supported
Supports FAT, FAT 16/32 up to 500GB

Android ready

Android ready
Direct connections via USB port
Play, charge and control from car stereo or steering wheel
Manage your tunes with free Google Android App

Bluetooth Streaming and Handsfree (optional)

Bluetooth Streaming and Handsfree (optional)
In hands free mode: accept & reject phone calls, voice dial
Bluetooth Audio streams directly from your phone to the stereo

iPod/iPhone/iPad Integration

iPod/iPhone/iPad Integration
Connect, play and charge iPod/iPhone/iPad 
Control with car stereo or steering wheel

In stock
-- OR --

Mercedes Benz 03-08 M.O.S.T. compatibility reference (.pdf) Check if yours is compatible with GROM-MST4-MBO Android iPhone Bluetooth Car Kit

USB Connection: GROM-MST4 car stereo adapter connects your USB 2.0 device such as flash drive, external hard drive or mass storage device to the stock stereo in your car. You can control the playback through your car stereo or steering wheel controls.

Android integration: via USB supports advanced control and browsing, requires DashLinQ Android Car Mode Dashboard App, available at Google Play Store For more information go to DashLinQ page

Android USB streaming: for select Android devices (Jelly Bean and up) is available without DashLinQ. You can stream music and use track up/down controls from any music application, while connected via USB.     

iPod, iPhone, iPad integration: Connect your Apple device to the factory car stereo via USB port. Play music (from any app), control from car stereo or steering wheel, and charge at the same time. Use standard USB to Apple connector cable (including Lightning style). All iPod, iPhone, iPad are compatible, including latest iPhone 12.

Bluetooth add-on (sold separately): Make hands free phone calls (HFP), stream music from your phone to the factory stereo via Bluetooth Audio playback (A2DP), control your music with the car stereo or steering wheel controls via Bluetooth wireless audio control (AVRCP) with the GROM Bluetooth Dongle 

DAB Radio add-on (sold separately): DBR1 DAB Radio Extension module enables listening to Digital Audio Broadcast via the MST4 kit. Assembly includes windscreen mount powered antenna.

AUX Input (sold separately): Aux connection (for any additional audio source such as DVD, MP3 player, DAB and more).


  • Your USB media, iPod/iPhone/iPad or Android phone becomes a virtual CD changer.
  • Change tracks, browse your music files, map them to the disc buttons all via your stereo or steering wheel controls.
  • Folders or playlists are assigned to the car stereo disc or folder buttons.
  • See album, artist and track names.
  • Connect and control additional devices, easily switch between them.
  • Legally and safely operate your audio device or phone whilst driving.
  • CD quality sound with level-matching technology.
  • Firmware upgradeable, universal interface fits many car makes and could be transferable to your next car!
  • 1 Year faulty unit exchange warranty & 14 day money back guarantee.


  • No fuss, easy DIY plug-and-play installation
  • No wiring needs to be cut or soldered.
  • The installation of this kit should not affect your vehicles warranty.
  • *See install video*


  • A Class 2004-2008 (W169)*
  • B Class 2005-2007 (W245)*
  • C Class 2004-2007 (W203)*
  • CL Class 2005-2006 (W219)*
  • CLK Class 2005-2009 (C209, W209)*
  • E Class 2003-2007 (W211)*
  • G Class 2005-2008 (W463)*
  • GL Class 2005-2008 (X164)*
  • ML Class 2005-2009 (W164)*
  • R Class 2005-2009 (W251)*
  • S Class 2003-2007 (W2200) (Comand only)
  • SL Class 2005-2007 (Comand only)
  • SLK, SLR, Viano 2005-2009 (Comand head unit)
  • Smart ForFour 2004-2006*
  • *(Audio 20 with CDC button, Audio 50 & Comand head units)

Important notes:

Factory CD changer will have to be disabled to use the GROM-MST4.

Check if your head unit is compatible with this guide




  • GROM-MST4 Multimedia Box
  • Fibre Optic cable (POF cable)
  • USB Type A Male / Type A Female cable
  • Operation manual

Optional Add-Ons:

  • GROM Bluetooth Dongle for hands free calling and wireless playback
  • Apple Lightning USB Cable 
  • Android Micro USB Cable
  • Aux-in 3.5mm cable for any MP3 player, mobile phone, DAB, Sat Nav etc
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