Car Digital Speedometer Head Up Display OBD2 II Overspeed Tired Warning AlarmCar HUD OBD2 Speedometer Features:Color LED screen high brightness display. Car HUD OBD2 Speedometer With a hood to block glare in driving for clearer displayCar HUD OBD2 Speedometer Easy installation, plug and playRich data display: driving speed / RPM/ tank temperature / battery voltage / mileage / automatic power on off,km/h and mph switchableCar HUD OBD2 Speedometer Can detect and clear car error diagnosis code without professional equipmentIf the speed is too high, the voltage is too low, or the water temperature is too high, there will be an alarm soCar HUD OBD2 Speedometer WITH 4 display modes (standard mode, compact mode, competitive mode, and mileage calculation), 16 display screens, and one button switchCar HUD OBD2 Speedometer Boot up with car, eep with car, and effectively protect car battery, while retaining the manual switch to better control the HUD