【GPS Speedometer】Collects the speed data from GPS satellites, no relation with car engine, no destroy to car circuit board or OBD port, and can be widely used on SUV ATV Pick-up Truck Scooter Golf Cart Bus Boat Train Bike Motorcycle… all vehicles on the market. 【HUD】Heads Up Display, display the digital driving speed on its own HD display. Compared to normal LED HUD on market, it doesn't need paste any project film on car glass, and it doesn't have double image under sunshine at noon. 【Main Functions】 Driving speed in MPH or KM/H KPH, compass, tme O'clock, ambient light , fatigue driving alert, over-speed alarm light reminder, and 5 different display UI and various combinations of 4 colors. 【On/Off automatically】 Built in vibration sensor, when detect car motion, it will be on and display the driving speed in big fonts; if keep stationary 100% for more than 3 minutes, it will be off. When it's off, no power consumption at all. 【Warranty】First time usage, it takes 10-30 seconds to get GPS signal, and it can't work indoor.It's a 2023 new GPS HUD Speedometer with best chipset Beidou and GPS, which can updates seed in each 1 MPH.