[HUD] Car 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. Only display speed in , no KM/H. [GPS Speedometer] Collects the speed data from GPS satellites, no relation with car engine, no 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. [Install] Easy install and use, no buttons, no need any setting, no need read manual, USB Cable plug and play. [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. First time usage, it takes 10- to get GPS signal, and it can't work indoor. Colour:Black Material:ABS Size:80x31x54mm Package Contents: 1 * Speedometer 1 * USB cable 1 * Anti- mat Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.