Large 5inch LCD display provides simultaneous viewing of speed in MPH and mileage, enhancing driver awareness and convenience on the road. Safety first: this GPS HUD speedometer alerts you when you exceed speed limits and reminds you to rest after four hours of driving to support safer journeys. Automatic brightness adjustment: a lightsensitive feature automatically adjusts screen brightness based on external lighting, ensuring readability during day and night driving. Advanced processing chip: a dualcore processor delivers realtime updates with minimal lag, improving overall driving experience. Use scenarios Regular daily driving: monitor current speed and trip mileage at a glance, with timely speedlimit alerts to help you stay within limits. Long highway trips: the rest reminder after four hours helps you plan breaks and reduce fatigue during extended drives. Night driving: automatic brightness keeps the display readable while minimizing glare for comfortable night operation.