3" Car Digital GPS Speedometer Head Up Display Overspeed MPH/KM/H Warning Alarm Features Safer and Easier Driving: The visual time from the main direction is reduced by 99%, allowing slight eye movement to capture speed information. It minimizes the frequency of line-of-sight adjustments, aiding in reducing eye fatigue. Clearer Display: Whether under strong sunlight or at night, different installation positions can be selected for a clear display of speed values. This device enhances driving safety and comfort; suitable for taxis and specialized vehicles. In bright sunlight, the speed display brightness adjusts automatically, increasing, while it decreases under low light conditions. Overspeed Alarm and Fatigue Driving Alarm: Speed values can be set for different alarms. An alarm will sound every hour of continuous driving. Mileage and Driving Time: The current mileage, driving time, and total mileage are displayed automatically. Altitude and local time display Other Functions: This device acquires speed data from satellites accurately and authoritatively, ensuring timely updates. Unit of Measure Switching—quickly switch between speed measurement units (KM/H and MPH) to cater to different regions. Specification: Type: GPS Speedometer Material: ABS+PC Screen Size: 3.0 inch Satellite Positioning Speed: 1 to 3 Minutes in open space; no satellite signal when indoors. (rainy days may affect satellite positioning speed) Package Includes 1 X Car GPS Speedometer 1 X USB Cable 1 X Installing Accessories Set 1 X Manual