1. Features: The front screen of the vehicle displays the real - time driving speed in large LED fonts, which are clear and easy to see. 2. It is equipped with a reflective film, which can clearly show the data on the windshield, allowing users to view the information without looking down. 3. The integrated shading design can block excess light, making night driving less glaring and safer. 4. It has a built - in light - sensing system. Whether it is day or night, the screen brightness will be adjusted according to the current environment. 5. It is plug - and - play, easy to use. It can start and stop with the vehicle, has low power consumption, and there is no need to worry about battery consumption. 6. It is small in size, does not block the line of sight, and is suitable for cars, trucks, SUVs, RVs, etc. 7. Light color: Green/White (optional) 8. Material: ABS 9. Input voltage: USB 5V 10. Unit: KM/H 11. Product size: 93 * 50 * 22mm / 3.7 * 2.0 * 0.9in. 12. Product weight: 33g / 1.2oz 13. Packaging size: 155 * 100 * 55mm / 6.1 * 3.9 * 2.2 inches 14. Packaging weight: 120g / 4.2oz 15. Packaging list: 1 * Head - mounted display, 1 * USB data cable, 1 * Reflector