C3 Navigation Version Head-up display: HUD short for Head Up Display.It displays driving data on the car windshield such as speed,RPM, water temperature,voltage,single mileage etc;avoiding drivers unsafely because of watching the instrument while driving. Drivers can read the driving information instantly, and always keep the best state on the way with HUD. Main Function:OBD+GPS 2 in 1 dual working system,which can work on all vehicles. Feature: OBD mode information display: vehicle speed, water temperature, voltage, fuel consumption, RPM, single mileage, total cumulative mileage, travel time, system time, intake pressure, oil temperature, air-fuel ratio, turbine pressure, intake pressure, acceleration test, brake test, read data stream. Alarm:Overspeed alarm, Speed alarm, High water temperature alarm, Low voltage alarm, Engine fault alarm, Clear fault code, Free switching between kilometer and miles,KM/h & MPH Switchfreely,C & switch freely. GPS mode information display: speed, travel time, satellite time, altitude, number of satellites, driving direction, single mileage, voltage, acceleration test, brake test, N avigation... Alarm: Overspeed alarm, Low voltage alarm, Free switching between kilometer and miles. HD display,no double image,clear effect in day time metal nanotechnology on the front side to remove unwanted reflections for clearer display Alarm: Overspeed alarm, Low voltage alarm, Free switching between kilometer and miles. Package Include: 1 x Head Up Display 1 x Power cable