Comprehensive Car Digital Speedometer - GPS-enabled heads-up display (HUD) that shows speed, travel direction indicators, and dual alert systems for overspeed and driver fatigue. Audible alerts are issued after 8 hours of continuous driving or when you exceed speed limits, helping keep your journey safe. Universal Compatibility and Easy Setup - Designed for universal 5V vehicle compatibility and rapid plug-and-play operation via USB. The initial setup includes locating satellite signals, indicated by a flashing satellite icon, ensuring accurate performance. Intelligent Automatic Brightness - Built-in light sensor automatically adjusts display brightness for optimal visibility in day or night conditions. Manual brightness adjustments are also easily accessible for personalized comfort. Advanced Windshield HUD - Transforms your windshield into a real-time data projection screen, clearly displaying speed and other critical information without cluttering your sightline. Enhances driving convenience and safety. Use scenarios - Long highway trips: rely on speed, direction indicators, and fatigue/overspeed alerts to maintain safe driving and smooth navigation over extended distances. - Daily city or highway commuting: plug-and-play setup and satellite signal readiness provide quick access to accurate speed data and directions with minimal setup. - Fleet or professional use: universal 5V compatibility and automatic brightness adapt to different vehicles and lighting conditions, while driver alerts support safer, compliant driving.