Great Compatibility: This head up display is GPS + Beido dual-mode chip. It is compatible with all vehicles aroundworld.refresh rate is 10 frames per second, andspeed ofcar changes smoothly and continuously.;Display Function: This head up display can diplay speed, driving mileage, compass angle, satellite icon.;Two Alarm functions: It supports overspeed alarm and fatigue driving alarm.over speed alarm settingis 30-250KM/H. Head up display will alarm whenvehicle speed reach tosetting value.fatigue driving alarm settingis 1 to 8 hours, head up display will give fatigue driving alarm when your continuous driving time reach tosetting value.;GPS Compass: It can dispay all directions, E(East), W(West), S(South), N(North).;Plug and play: UseUSB cable to collect lighter.
