Features:Great Compatibility: This head up display is GPS + Beido dual-mode chip. It is compatible with all vehicles around the world. The refresh rate is 10 frames per second, and the speed of the car changes smoothly and continuously.Display Function: This head up display can diplay speed, driving mileage, clock, compass angle and satellite icon.Two Alarm functions: It supports overspeed alarm and fatigue driving alarm. The over speed alarm setting range is 30-250KM/H. Head up display will alarm when the vehicle speed reach to the setting value. The fatigue driving alarm setting range is 1 to 8 hours, head up display will give fatigue driving alarm when your continuous driving time reach to the setting value.GPS Compass: It can dispay all directions, E(East), W(West), S(South), N(North).Easy To Install:Plug and play, Use the USB cable to collect the cigarette lighter.