Viseeo MB-4 is just an updated version of MB-2.
Neither unit will allow you to stream music.
Viseeo's are for calls only.
Copied from the Comand Online website
If you have a car with the fixed Nokia 6x10 cradle attached by a curly cable, you need to use the ViseeO MBU-3000 Bluetooth Adapter. It is the only integrated Bluetooth solution that will work without replacing the whole phone system
If you have a car with the UHI/MHI system:- if it is before mid 2004 you need to use the ViseeO MB-4 Bluetooth Adapter. You can not use the ViseeO MBU-3000 in a UHI 6310i cradle. If the car is post mid 2004 you can use the MB-4 or any Mercedes Bluetooth adapter such as the Mercedes HFP adapter or a phone specific cradle such as the Mercedes iPhone 4 phone cradle.
If you have a car with the Comfort Phone system, again to provide Bluetooth you can use a Viseeo MB-4 Bluetooth device, or a Mercedes HFP Bluetooth adapter, or any of the phone specific cradles.
You should note that most of the Mercedes phone specific cradles use Bluetooth to access the phone, so it can be in your pocket but when you plug it into the cradle it charges and uses the vehicles external aerial.
Please contact us with your VIN if your car is 2004/2005 as we can confirm whether you can use the Mercedes HFP Bluetooth adapter or phone specific cradles.