Overview: This product is for drivers"'" safety, at high speeds, especially in high-speed driving at night, in order to avoid the driver to look down their head to watch the instrument, and decrease car accident. HUD can project the important information displayed by the instrument (such as speed) onto the windshield, it can not only to help determine the speed of inexperienced novice to control their speed and avoid many of the speed limit road due to speeding violation. More importantly, it enables the driver instantly read the number in great vision and always make drivers eyes on the road in clear mind. Features: Plug and Play: HUD can auto adapt to vehicle type which in line with OBD2 or EUOBD(On-Board Diagnostic System). Comprehensive Display: Vehicle speed, engine speed, water temperature, fuel consumption, mileage, low fuel tips, engine failure. Flexible Alarm Mode: HUD can offer single-stage and four-stage over-speed alarm modes to choose to make driving safer. Engine Speed Alarm: It contributes to shift gear in time to save fuel also has significance to new driver. Automatic Power ON/OFF: Starting and stopping with vehicle starting and stopping. Moreover, it is also designed with hand switch function. Freely Switch: The car head up display supports Km and mile switched freely so as to meet the needs of inch auto meter. Driving Information Display Mode: Driver can chose normal display mode, high speed display mode or automatic display mode. Specifications: Environment Temperature: -40~+80 Barometric Press: 86~106 KPa Relative Humidity: 10%~95% Environment Voice: 60 dB(A) Alarm of Sound Level:30 dB(A) Work Voltage: 9V~16V DC (12V DC / 400mA) Item Size: 15*8.5*1.5cm / 5.9*3.34*0.59in Package Size: 16.5*13*4.5cm / 6.49*5.12*1.77in Package Weight: 280g / 9.87oz Package List: 1 * HUD Host 1 * OBD2 Interface 1 * Mat 1 * Reflective Film 1 * English User Manual Many Questions about Drop