I too bought the RMT 200 bluetooth radio for its functionality and its sorta close OEM appearance. It is a great unit even though there seems to be an amplifier connectivity issue. I've had some difficulty getting it to operate for lack of documentation. Here is the Instruction Manual for the RMT 200 unit in PDF format. In particular the Manual explains how to enter the security code to power the unit on. Also explains the time lockout period for improper/failed code entry.