Human Creations OBD-II Head Up Display Speedometer with Speed (Miles/KM), RPM, Voltage, Water Temp. (easy self installation) Easy installation using your car's OBD-II port; mounts onto dashboard with adjustable bracket Projects onto the windshield your vehicle speed, engine RPM, battery voltage and coolant temperature Warning settings available for all 4 monitored parameters Three level automatic brightness adjustment according to ambient light level One-year warranty