Features: 1.Multi Functional: Displays a variety of functions including GPS speed, driving direction, over speed alarm, and more. Automatic switch between km/h and MPH for convenient control. 2.Automatic Light Adjust: Built in light sensing system, which could adjusts screen brightness for comfortable viewing experience during the day or night. 3.Driving Safety: Mounted on the dashboard, does not block your view for easy and safe driving. Displays speed and direction without having to look down while driving. 4.High Precision: The HUD speedometer gauge adopts GPS and for BeiDou dual mode chips, which could provide fast refresh speed and no delay while operating. 5.Non Destructive Installation: The package includes a pair of double sided tapes, which can firmly fix the gauge on the dashboard, easy for installation and disassembly. Specification: Item Type: GPS Speedometer Material: ABS, metal Voltage: DC 5V Functions: Speed Time Driving distance Single travel distance Single travel time Number of satellites 100 km accelerator time Driving direction angle Speed alarm Fatigue driving reminder Mile Kilometer switching Automatically adjusted brightness