1Multifunctional: This Hud can not only display the speed of the vehicle in time, but also display the driving direction, single driving time, and single driving mileage through the compass. 2Timely and Accurate: The speed and compass data come from satellites, which are timely and accurate, especially the direction of the compass is not affected by the magnetic field. 3Easy to Read: Large screen size display, large and green fonts, 7 colors can be switched at will, reading is easier and more comfortable, protects the driver's eyes, especially suitable for long distance driving. 4Safe and Reliable: The shell is made of high temperature resistant Abs material, which will not deform at 80 for 3 hours. No built in battery, does not explode at high temperature. 5Applies to All Vehicles: Collecting speed from Gps satellites. Regardless of car engine, Hud is compatible with all vehicles including cars, trucks, pickups, suvs, scooters, trains, motorcycles, bicycles, boats.