Specifications:Display Information: Speed, RPM, Fuel, Consumption, Voltage, Water Temperature, Trip Mileage, Trip Time, Total Mileage, Turbo boost, Oil TemperatureAlarm: RPM AlarmWater Temperature AlarmLow Voltage AlarmFaulty Code AlarmEnvironment temperature: -40c- + 80catmospheric pressure: 86-106 KPaRelative Humidity: 10% -95%environmental noise: <= 60dB (A)Alarm sound level: =30dB(A)Working voltage: 11V ~ 18Vdc (12Vdc/200mA)Product size: 4.2 * 1.1 * 7.7cm / 1.65 * 0.43 * 3.03inProduct weight: 130g / 4.59ouncePackage size: 18*14.5*5cm / 7.09 * 5.71 * 1.97inPackage weight: 370g / 13.05ounce Car HUD connects car OBD interface, and display the driving data, e.g. vehicle speed, engine RPM, water temperature, etc. It can keep the driver's eyes always on road avoiding the dangerous of lowering downhead to read the dashboard.Features:Easy to install and use.Available for car with OBD port(Car automatic diagnosis system), plug and play.HUD can eliminate the fault code displayed on the engine dashboard without the need of professional equipment.Exquisite and unique design, free from external light, and stereo imaging is not ghosted.Multi-functional: vehicle speed, RPM, water temperature, battery voltage, driving time & distance, low voltage alarm, high water temperature alarm, over speed alarm, engine fault code alarm etc.