Features: After connecting to the power supply, car HUD head up display can work directly without any other operations. No skip speed, more coherent and smooth display. Highdefinition LED, even in the sun digital speed meter can also receive praise. And large font, clearly visible during the day and night. This device is a GPSdigital speedometer, and the speed is collected from satellites. So if you test at home or a parking lot, perhaps the speed cannot be displayed correctly. Please conduct the test outside the vehicle with good signal. Built-in GPSand Beidou chip, car HUD head up display is suitable for all car, buses, trucks, bicycles, scooters. Universal: Suitable for all vehicles, such as car, pickup trucks, bus,etc. Specifications: Material:ABS Display Color:White,Green Type:KMH,MPH Size:Approx.92mm or 3.62''x52mm or 2.03''x20mm or 0.79'' Package Includes: 1Set HUD note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.