This adaptor allows the installation of a car radio with iso connection in vehicles with oem system wiring car radio adapter cable function ignition off radio slows down in order to protect the car battery the can bus adapter goes in sleep mode and switches onoff after about 40 s this adaptor is required if a oem device is not installed in the vehicle the operating voltage is measured at the fuse box aerial adaper function this adaptor allows the connection of a car radio to foreign b