1All in One Display: Vehicle speed, water temperature, voltage, fuel consumption, speed, single mileage, time, intake pressure, oil temperature, air fuel ratio, turbine pressure, intake pressure. 2Diagnostic Scan Gauge: Can quickly perform acceleration test, brake test, clear fault code, read data stream, help you to accurately identify the cause of your engine failure. 3Alarm: Adopts high precision warning systems, and in the overspeed, abnormal speed, water temperature is too high, voltage abnormal situation is immediately alarmed. 4Practical: Accessing data directly from car computer and display it in a large digital 3.0in color Lcd, avoid accident happening when you're driving with head down. 5Wide Application: Works on OBD2 gasoline vehicles produced after 2004 in Usa, and after 2008 in other countries. Simply plug into Obdii Port, it will get power on and follow the on screen instruction to go.