Multifunctional: This HUD can not only display the vehicle's driving speed in time, but also display the driving direction, single driving time and single driving mileage through the compass. High precision: The speed and compass data come from satellites, and the compass direction is the vehicle's direction, which is not affected by geomagnetism. Alarm function: Speed 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. Clear digital display: Large screen, easier to read. The large green font will make the driver more comfortable and protect his eyes, especially suitable for long-distance driving. Universal Fit: Compatible with all vehicles, including cars, trucks, vans, SUVs, scooters, trains, motorcycles, bicycles, boats, etc.