3.5 inches car overspeed alarm hud obd2 head up display auto power on/off and brightness adjustment alarm system

automatically adapts to car in line with obd ii or euobd plug. this unit only works with america cars newer than 2003, works with other brand cars newer than 2007. new function: the nano-technology to eliminate unwanted reflections and make display information sharper; automatic and manual brightness adjustment mode; auto power on and off, effective protection of the car battery; display rich content: speed, engine speed, water temperature, battery voltage, instantaneous fuel consumption, etc.