This CAN interface needs to be "hard wired" to the vehicle. The following outputs are provided (subject to vehicle application)

Tone Control
Speed Pulse

OEM radios on certain new vehicles may generate the parking sensor tones. The CAN21 is used to restore parking sensor tone following removal of the original radio on:

BMW
Peugeot
Cirtoen
Landrover

The CAN21 comes standard with one buzzer - additional buzzer(s) are available - PSB100. Typically an additional buzzer is required if the vehicle has both Front & Rear parking sensors.