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5.00 out of 5 based on 1 customer rating
(1 customer review)


Get more from your kit, make the most of the two extension ports!

Phone Cables

Grab a spare phone cable for the car.

This product is covered by our compatibility guarantee!

Product Handsfree BT Music Digital Radio Misc
Basic Phonebook & Call Lists via BT iPod/iPhone via Cable via USB AUX-IN Text Display Menu Browsing USB Charge
GROM MST4 select
If you’ve landed here it likely means your car has the fibre optic system MOST. It doesn’t leave you with as much choice hence the dearer price over the other Grom kits. MOST of them (yes, a pun) are very simple to fit too. Some being even easier than normal cars and gives you digital quality (without relying on NBN!)


The future in USB car integration

The GROM MST4 comes with everything you need to make your existing car stereo working like a brand new one, leading the field with near-universal support for any USB stick, drive, or phone – straight out of the box. Fully integrate a USB2.0 port into your car allowing you to control playback through your car stereo or steering wheel controls.

Stream or play your tunes

Offering support for MP3, M4A, OGG, FLAC, AAC, WAV audio files, or just stream your music direct from your Apple or Android device. The GROM MST4 does it all, giving you unparalleled audio quality via a direct cable connection to your car stereo.

Get even more out of your Android device with GROMs DashLinQ app.

It can do it all, even bluetooth

The MST4 comes equipped with a USB port that connects to any USB drive, Android, and Apple 30-Pin or Lightning device. But on top of that, you can supercharge this unit with an optional Bluetooth Dongle giving you the best of both worlds – enabling handsfree calling via bluetooth as well as audio streaming via A2DP.


Unfortunately Grom doesnt show this with the Bluetooth extension in this clip. But it just plugs in and then you mount the microphone and stream away!

If you can make a better video than this we are willing to refund you half your purchase price please contact us

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  1. 5 out of 5

    (verified owner)

    It’s the best add on system I have ever come across.
    It is very easy to install and use!

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