Apen Switch Elm327 Bluetooth Obdii Obd2 Diagnostic Scanner Scan Tool Car Code Reader Switch Elm327 Bluetooth OBDII Obd2 Diagnostic Scanner Scan Tool Car Code Reader With a switch to turn on/ off these indicator lights. The newly developed high-quality wireless scan tool, support all OBD2 protocols. Small bluetooth interface with a 16 pin socket. Support different kinds of devices to use this scan tool: Android system phones, Symbian system phones, Windows XP and WIN7 32bite computers.