Universal Digital GPS Speedometer Car Hud Up Display With Speed Alert Fatigue Driving Alarm,For All Cars Truck Feature: Safe AlarmOverspeed Alarm to ensure your safe in LONG DISTANC-E driving Key Information DisplayHead-up display the speed,KM/h, Driving Time and Distance Calculate and Display,let you KNO-W the key information for your trip Green DisplayAuto adjust brightness through sensor for Day & NIGH-T DRIVIN-G. Green display can the driver's eyes ,let driver feel more comfortable Plug & PlayThis HUD caculate & display the real-time speed via GPS. No Need professiona-l installation, No wiring needed to the VS-S (vehicle speed signal) UNIVERSAL FOR ALL VEHICLECollecting speed from GPS satellites. No relation with the car engine, therefore, it's compatible for all vehicles include car, truck, pick-up, suv Product parameters: Type: ON BOAR-D HUD up display Applicable model: General Screen type: instrument Input signal: GPS signal Picture tube: LED Speed Alarm GPS SATELLIT-E measurement Statistics of single driving mileage Statistics of single driving time Fatigue driving alarm Screen size: 3.0inch Easy installation without wiring Product size: 10.7x5.8cm/4.21x2.28 inch Package size: 11.5x6.5x7.1cm/4.52x2.56x2.79 inch Gross weight: 158g/0.35 lb The Package Include: 1 x HUD Speedometer 1 x Usb cable 1 x Holder 1 x Instructions