1. Intelligent Automatic Brightness: Equipped with a builtin light sensor, the HUD intuitively adjusts its brightness to provide visibility in varying lighting conditions, day or night. Manual adjustments can also be made easily. 2. Universal Compatibility Easy Setup: Designed for universal 5V vehicle compatibility, this plugandplay speedometer connects effortlessly via USB. Initial setup includes allowing the device to locate satellite signals, indicated by a flashing satellite, ensuring accurate performance. 3. Comprehensive Car Digital Speedometer: Beyond speed measurement, this GPSenabled HUD offers travel direction indicators and dual alert systems for overspeed and driver fatigue. It prompts you with audible alerts after 8 hours of continuous driving or when exceeding speed limits, ensuring your journey remains safe. 4. Advanced Windshield HUD: This innovative headsup display transforms your vehicle's windshield into a realtime data projection screen. Clearly displaying speed and other critical data without cluttering your sightline, this digital companion enhances both your driving convenience and safety.