1Universal Fit: Please use it within 5V. Adopt Gps mode, Hud display could work for all vehicles, such as trucks, bikes and motorcycles, you don't need to worry about compatibility. 2Precise Positioning and Realtime Display: Display driving speed, time, voltage, driving icon, Driving mileage, automatic light adjustment, alarm sound switch, satellite number, Altitude, compass , automatic switch. 3Overspeed and Fatigue Driving Alarm: Default setting is 120KM/H or 120MPH. When over?speed alarm is active, it will beep in 3 times to alert the car driver, you can adjust according to whether you need overspeed alarm. 4Clear and Intuitive: The large digital display protects the driver's eyes from dazzling day or night, making the driver feel more comfortable, especially on long drives. 5Simple Operation: Easy to Set up, no complicated operation required. Only connect with USB cable, no professional installation is required. Compatible with all kind of cars and trucks, ect.