Echoman EM03A Universal GPS Car Head Up Display, HUD, Speedometer, Time, Direction, Altitude, Over speed Indication, Plug & Play, for all Car Models Head-up display - projects vehicle speed, time, direction and altitude on windshield Plug to play - simply plug into your car's cigarette lighter Automatic brightness adjustment to suit ambient light Big display panel . Over speed indication. HUD only works on kilometers The altitude could only be measured in meters. Using -04:00 for Eastern Daylight time handles the midnight transition properly.