i have a motorola bluetooth kit, $50 on ebay .15 minutes to hardwire it.
they also sell a interface to hook the speaker into the ontsar ,so that it plays through the speakers.i didnt bother it was more wiring and the 5 watt speaker the kit comes with is plenty loud.
http://cgi.ebay.com/MOTOROLA-HF850-BLUETOOTH-CAR-KIT_W0QQitemZ300183399392QQihZ020QQcategoryZ108599 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem