This product is an intelligent on-board diagnostic product complied with OBD II/EOBD standard. It supports OBD or non-OBD standard physical layer, data link layer and protocol application layer, it can connect to a communication box with serial port, or a smart phone and PND/CPND with Bluetooth. It is installed onto the on-board Diagnostic Link Connector, communicates with ECU continuously and transmits vehicle’s data via serial lines or Bluetooth to the connected device. Compact design, Supports plug-and-play function Works with all cars compliant with OBD II DTC list reading and maintenance/repair suggestions Clear trouble codes Driving behavior analysis Bluetooth connected to Android smart phone/PND/CPND.