USB Connection: GROM-USB 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. With GROM-USB you can listen to your digital music library and control the playback through your car stereo controls.
Bluetooth: Use your phone in the car hands free (HFP), stream your MP3 music from your phone to the factory stereo via Bluetooth Audio playback (A2DP),
control your MP3 music with the car stereo or steering wheel controls via Bluetooth wireless audio control (AVRCP) with the
GROM Bluetooth Dongle
AUX Input: Aux connection (for any additional audio source such as DVD, MP3 player, XM and more) via GROM AUX MiniDin to 3.5mm audio cable, 6FT. Operation of USB is simple:
- Transfer your MP3/WMA/iTunes (AAC) files to USB stick/disk/drive
- Connect GROM-USB car kit to your car stereo via CD changer port
- Connect USB male to female cable to GROM
- Plug-in USB disk / stick / drive into GROM
Now your stereo:
- Converted USB disk into virtual CD changer
- Plays MP3 / WMA / iTunes (AAC) files
- Browse your music files via car stereo buttons (check Operation Manual)
- Navigates through directories and map them to the disc buttons on your car stereo or steering wheel controls
- Plays higher than CD quality (18 bits) sound directly to your car stereo
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Provides additional AUX input via RCA and 3.5mm cable (you will need to get GROM MiniDin to 3.5mm audio cable for that)
- Provides additional iPod/iPhone interface with full control and charge with GROM IPOD 5V cable for USB
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Provides Bluetooth hands free and wireless music playback from your mobile phone with the additional GROM Bluetooth Dongle
Note: Since there is only one EXT port on the GROM USB adapter box you may only have one of two - Bluetooth or AUX cable - connected at a time. Main characteristics:
- Built-in high quality (18 bits,low noise) MP3 / WMA Decoder
- Supports USB Stick / flash drive / mass storage device
- FAT 16/32 system supported
- Higher than CD quality sound of your MP3 files with level-matching technology
- Full control over the music via steering wheel or car stereo controls
- Maps discs to root folders
- Shuffle, scan, repeat through your MP3/WMA files
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Additional audio MiniDin to 3.5mm cableto connect any MP3/Audio player
- Bluetooth handsfree and wireless music playback from your mobile phone via GROM Bluetooth Dongle
- Playlist positions are preserved for several USB sticks
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For more information on folders, formats, operation and limits- read FAQ
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Firmware upgradeable, universal interface fits many car makes
Technical specs:
- Operating temperature: -40C - +85C (-50F - +200F)
- Operational current: ~150mA
- Standby current: ~2mA
- SN Ratio: 70dB
- DAC resolution: 18bit
- Total harmonic distortion: 0.1%
Important:Please carefully check the compatibility list for your vehicle. You can also check the CD changer port at the back of your stereo and compare it to the following chart
GROM-BMW is available with 2 cable choices - BMW-C for dashboard mounting and BMW-T cable for trunk mounting.
Depending on where would you like to mount your adapter you can choose between those two choices.
Below are the pictures of BMW cable (left) and RMW-T cable ( right).

Pros of using BMT-T (trunk mounting) cable
- No need to take out the stereo or disassemble the dashboard in order to gain access to the CD changer port
- Less time for an instalation work
If you need to have 2 cables you can buy an additional cable hereNote: For BMW with navigation you have to select trunk mounting as we do not carry navigation dash mounting cables.Note: For Rover you have to select dashboard mounting as we do not carry trunk mounting cables for Rover.