Head up Displayshort for Head Up Display,the main function is to display the car dashboard information (e.g.speed,RPM,water temperature,voltage,trip distance etc ),and keep the driver eyes always on road to avoid the dangerous of lowering down head to read the dashboard. Features: Multi function: speed,engine RPM,water temperature,voltage,driving distance: speed,engine RPM,water temperature,voltage,driving distance. Alarm: water temperature alarm, voltage alarm, gear shift reminder, overspeed alarm, fatigue driving reminder, engine failure alarm. Exquisite design. High-definition display lens, not affected by external light. The stereoscopic imaging of the highlighted LED display does not have ghosting, no film is required, and there is no unnecessary reflection. Plug and play, easy to operate. Hi-tech assisted driving is safer. The Head up Display can eliminate the trouble code displayed on the engine dashboard. No need for professional equipment. The product automatically switches on and off. There will be a beeping alarm when overspeed and the voltage and water temperature is abnormal to prevent engine failure in advance. Specifications: Screen size: 3inch Display Information: Speed, RPM, Fuel, Consumption, Voltage, Water Temperature, Trip Mileage, Trip Time, Total Mileage, Turbo boost, Oil Temperature Alarm: RPM AlarmWater Temperature AlarmLow Voltage AlarmFaulty Code Alarm Environment temperature: -40+80 Atmospheric pressure: 86-106 KPa Environmental noise: