The little book that came with the adapter says "Mercedes Benz V60 adaptor with Bluetooth wireless technology." I bought it from a guy on Ebay, and he included a cable that plugs directly into the adapter and then into the cable that's prewired up to the head unit, but it will also just plug into the V60 adapter if it's installed in the car.
http://wireless4mb.com calls it a V60 bluetooth cradle adaptor, and has it for sale. They also show a list of fully compatible phones on their website, but it will work with any bluetooth phone, but may not download the phone book. I think the dealer price is lower than the price shown on that website, and you may be able to get one on Ebay for less also. Also, you MAY need to update the pse module in your vehicle - I read a post on another website that says the ones with a white sticker don't support the adaptor, and the ones with a blue sticker do. Shouldn't be too hard to find a newer pse module on Ebay.