C100 OBD2 HUD Head Up Display KM/h MPH Car Speed Projector Mirror HUD Main Functions: -Speed(Km/h or MPH),over speed alarm -RPM, RPM Alarm -water temperature(°C or °F), high water temperature alarm -voltage, low voltage alarm menu or auto adjust the brightness Please note: 1.Please manually turn off the HUD,when you don't drive your car for more than a week. 2.OBD System Only Compatible With Petrol Car ,Not compatible With Diesel Car Electric Car hybrid vehicle. Accessories 1*device+1*OBD2 cable, 1*anti-slip mat, 1*User manual HUD MAIN FUNCTIONS Speed alarm/The oil temperature/Hot oil alarm/Instant voltage/Speed/The mileage Short pull up to switch display mode mode 1: speed mode 2: Speed + RPM mode 3: Speed + Water Temperature mode 4: Speed+ RPM + Water Temperature Clear the fault code Product Introduction: HUD short for Head Up Display,the main function is to display the car dashboard information (e.g.speed,RPM,water temperature,voltage,trip distance etc ),and keep the driver eyes always on road to avoid the dangerous of lowering down head to read the dashboard. button function: turn off/turn on 1.Short Press'