Driving: head display holder shows enough information directly to you, which allowing you to maintain constant focus on traffic, with no extra distraction. letting you see navigation instructions clearly without lowering your head. simple function: simple design, minus complicated functions. this head display can diplay speed, driving direction and number of satellites. two alarm functions: it supports overspeed alarm and fatigue driving alarm. over speed alarm setting is 30-250km/h. head display will alarm when vehicle speed reach to setting value. fatigue driving alarm setting is 1 to 4 hours, head display will give fatigue driving alarm when your continuous driving time reach to setting value. great compatibility: this head display is gps + beido dual-mode chip. it is compatible with all vehicles around world. refresh rate is 10 frames per second, and speed of car changes smoothly and continuously. compass: n (north) e (east) w (west) s (south), after satellite is found, gps light stops flashing and stays on for normal use.
