KONNWEI KW903 Bluetooth OBD II interface Car Auto Diagnostic Scan Tools Black-Red 1.Small size, compact structure.Plug and never unplug 2.Stable wireless connection. No wires or batteries (adapter is powered by the diagnosis size sockets) 3. Stop communication, wait half an hour, auto sleep 4. Supports all OBDII protocols,Compatible with Android phones Only - NOT FOR USE WITH iOS DEVICES! Wireless (Bluetooth). 5. The adapter uses the fastest and most reliable ARM chips