3" Car Digital GPS Speedometer Head Up Display Overspeed MPH/KM/H Warning AlarmCar GPS HUD Speedometer FeaturesSafer and Easier Driving: The visual time from the main direction is reduced by 99%, and slight eye movement Car GPS HUD Speedometer can capture the speed information. Car GPS HUD Speedometer Reduce the frequency of line-of-sight adjustment, adjust the intensity of the eyeball direction, and Car GPS HUD Speedometer reduce eye fatigueClearer Display: Under strong sun light or at night, you can choose different installation positions and clearly display the speed value. The speed information is publicized, Car GPS HUD Speedometer improves driving safety and comfort; Car GPS HUD Speedometer suitable for taxi and special cars. Under strong sun light, the Car GPS HUD Speedometer speed display brightness will automatically increase. Under low light, the speed display brightness will automatically reduceOverspeed alarm and Fatigue Driving Alarm: Car GPS HUD Speedometer Can set different alarm speed values. Every 1 hour of continuous driving, it will alarm 1 time. Mileage and Driving Time: The car will automatically display the current mileage, the current driving time and the total mileage. Altitude and local time displayOther Functions: Car GPS HUD Speedometer Acquire speed data from satellite-accurate, timely, and authoritative. Unit of Measure Switching-Quickly switch speed measurement units (KM/H and MPH) to meet the needs of different areas.Car GPS HUD Speedometer Specification:Type : GPS SpeedometerCar GPS HUD Speedometer Material : ABS+PCCar GPS HUD Speedometer Screen Size : 3.0 inchCar GPS HUD Speedometer Satellite Positioning Speed : 1 to 3 Minutes in open space; no satellite signal when indoor. (rainy days affect satellite positioning speed)Package Includes1 X Car GPS HUD Speedometer1 X USB Cable1 X Installing Accessories Set1 X Manual