1Multifunction Hud: This Hud can not only display the driving speed of the vehicle in time, but also display the driving direction, single driving time and single driving mileage through the compass. 2High Accuracy: Accurately search the number of satellites, speed and compass data from satellites, timely and accurate. Especially the direction of the compass is not affected by the magnetic field. 3Alarm Function: Overspeed alarm and fatigue driving alarm to ensure your safe travel. The default setting is 120KM/H or 120MPH. You can adjust it according to your needs. 43in Screen: Large screen display, easier and more comfortable to read. Large and green font, the green light will protect the driver's eyes, especially suitable for long distance driving. 5Universal Fit: Collect speed from Gps satellites, not related to car engine, so it is compatible with all vehicles, including cars, trucks, pickups, SUVs, scooters, trains, , bicycles, boats.