1. Product Description H4's latest car headup display, a windshield projector with color display. Large font display is clearer and the projection is cooler. 2. HUD Function Primary display of auto speedometer, realtime vehicle speed, and compass. It can switch between miles and kilometers to meet the needs of different countries. 3. Why Do You Need HUD? Test results show that when a car is driving at 60KM/H, lowering your head for one second is equivalent to driving blind for 16 meters. HUD eliminates the need to look down, allowing you to know the actual speed of the car, thereby improving driving safety. 4. Clearly Visible in Sunlight Designed by professional HUD manufacturers based on the photoelectric effect principle, it automatically detects ambient light—clearly visible during the day and nonglaring at night. 5. Plug and Play Installation takes only 5 seconds—just connect the USB port to start using.