Car Digital GPS Speedometer HUD Over Speed MPH/KM Fatigue Warning AlertFunction:SIMPLE AND SAFE: Focus on the data that matters most: speed, speeding alerts, driving directions, so you can keep your eyes on the road, undisturbed by other instrumentation factors.GOOD PERFORMANCE: The car GPS speedometer head-up display offers digital speed just like you'd expect from a digital speedometer at a very reasonable price. Car GPS Speedometer HUD is great for analog and digital display without having to buy a vehicle based on the type of speedometer.SIMPLE AND EASY TO OPERATE: This Car GPS Speedometer HUD is powered by a car charger, plug and play, Car GPS Speedometer HUD, no professional installation required.Automatic power on/off: The head-up display of the car GPS speedometer starts and closes with the start and close of the vehicle, and the head-up display of the car GPS speedometer effectively protects the car battery; the manual switching mode is reserved, and the HUD control is more convenient.Car GPS speedometer head-up display with automatic and manual brightness adjustment modes for glare-free driving.Car GPS Speedometer HUD is fully compatible with all cars, vehicles and trucks.Two modes, one-key switching: standard mode displays speed + driving direction + speed shift meter; simple mode only displays speed.Using nanotechnology, the picture is clearer: the front is made of metal to remove excess reflections and make the picture clearer.Car GPS Speedometer HUD Specifications:Screen size: 3.5 inchesDisplay size: 90x54x12 mm