It is an additional adapter that lets you read data from your installed CAN equipment contactless. ECAN01 adapter must be used in conjunction with LV-CAN200, ALL-CAN300, FMB140 or FM6300, FMB640, FMM640, FMC640 to read J1939 CAN data. It reads CAN bus data through the insulation of wires without damaging them and forwards signals to tracking device.