I got a bt Interphone off Ebay (About £30) had it about a year now still going plays music answers calls and if its paired with another one you can talk to a passenger. Battery lasts about 3 hours contious use 7 hours on standby and you have auto answer and it does voice dial. starts to get a bit hard to talk to the Mrs after about 80mph. The only thing that lets them down is the double sided tape is abit usless but Halfords do number plate tape and mine has stuck like a lympet since i changed the tape. Hope this helps.