GPS navigation display for cars with overspeed alarm1、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. 2、Display Function: This head up display can diplay driving speed, driving direction, trip distance and number of satellite. 3、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. 4、Automatic light adjustment: It can adjust its own brightness according to the environment. Clear display, no glare when driving. 5、Atomatic Turn On/Off: Automatically turn on and off as the car starts and stops. 6、Compact Design: The compact body suitable for placement. No matter where it is placed, it is clear and natural, and dose not block any sight.