All  VLines here now! Read the reviews I am getting! 

New  VLites here in stock too



5.00 out of 5 based on 5 customer ratings
(5 customer reviews)


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 (add on)

The MST4 comes equipped with a USB port that connects to any USB drive, Android (prior to Version 9), and Apple Lightning device or the old 30 pin. 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

Some Volvo cars may need to have a security patch removed. The latest car I have seen is now 2006. I have a network of a few dealers that have done it. Ask for info

Weight .3 kg


  1. 5 out of 5

    Excellent customer service.
    Great product with terrific customer support, big thanks to Skot for sorting out everything and making it all happen.

  2. 5 out of 5

    (verified owner)

    I am extremely happy with not only the Grom unit but the service . Very impressive.
    My Volvo had no hands free or Bluetooth, Skot explained the unit in detail and helped with an audio electrician here in Perth.
    The unit works very well, the installation professionally done.
    5 star service and 5 star Grom unit.
    [VOLSO4 + BTD 06 S70]

  3. 5 out of 5

    (verified owner)

    The end result is fantastic but it was a bit of a process to get there. My queries were promptly answered, delivery was swift, installation was straightforward. However I encountered the MOST security issue which required a trip to Volvo for a software patch. Skot was super supportive the whole way and the sound quality and functionality provided by the unit is a joy. (2005 Volvo XC90 2.5T)
    {GROM MST4 VOLSO4 & BTD Single CD}

  4. 5 out of 5

    (verified owner)

    I bought this a couple of weeks ago and it is great!
    The service from Cushieaudio was also great and the unit arrived within a few days too.
    {2009 Volvo V50 VOLS604, BTD & 35USB}

  5. 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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Got something to discuss?

2 years 5 months ago

 Thu, 12/09/21 7:27 am
All sorted and working perfectly. I visited Tim Dunn at Volvo Penrith and
got a few things sorted out on my car. Difficult to isolate the true cost
of the MOST patch but <$100. Thank you for all your help Skot!

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