Echoman EM03B Universal GPS Car Head Up Display, HUD with attachable polarizing pad, Speedometer, Time, Compass, Over speed Indication, Plug & Play, for all Car Models Head-up display - projects vehicle speed, time, direction and compass on windshield Attachable polarizing pad, no need to paste film on windshield Plug to play - simply plug into your car's cigarette lighter Automatic brightness adjustment Over speed indication. HUD only works on kilometers.