GEYIREN A900 HUD Head Up Display Car What is HUD ? The Head-Up Display or HUD is part of the driving assistance system which allows the driver to keep his head up, looking at the road, while having access to various information in real time.Such as speed water temperature voltage RPM... Product Display Details A. OBDII cable input B. Power button C. Setting button: Three ways of setting button: a. Up button = up motionb. Ok button = inward button presses c. Down button = down motion1.Engine RPM 2.Alarm (On/Off Option) 3.Speed unit at KM/H 4.Speed unit at MPH 5.Light sensor (Automatically adjust the brightness according to the environment) 6.Voltage icon 7.RPM unit 8.Water temperature icon 9.Multi-function area: speed, water temperature, voltage Light SensorAutomatically adjust the brightness according to the environment. you can adjust brightness by yourself(for there are 5 grade light,0 for automatic brightness adjustment, 1 is darkest, 2-5 is becoming brighter) Reflective FilmHUD adopts nano-technology to get rid of double reflection. Its integrated sun shade assists to avoid interference with vision and delivers clearer display and visibility in day time while you enjoy your driving in the night without any glareSpeeding AlarmIt will automatically alarm if overspeed, so it can save you from looking down the speedometer and drive safely.You can freely set this value. Setting Speed range: 30-199KM/H. (The device default alarm speed is 150km/h) Safety DrivingA900 HUD for everyday commute to stay focused while driving Choose Your Preferred6 differents display interfaces Water Temperature & Voltage AlarmA900 HUD will give alarm when your car"'"s water temperature & voltage is going wrong Main Funtion1.Display data : speed, water temperature, voltage2.Alarm function : speeding alarm,RPM alarm,voltage alarm,fatigue driving alarm,water temperature alarm.3.freely switch between kilometers & miles.Easy to installStep1: Insert the OBD socket connector. Step2: The wire is stuffed into the A-pillar sealing strip. Step3: Connect one end of the obd interface to the HUD and place the HUD to a suitable position Packing List1x A900Head Up Display 1 x Non-slip mat 1 x Reflective film 1 x OBD Cable 1 x English User Manual Note:OBD 2 Version: Compatible for: Cars in OBD II Standard (after 2007 years).(Diesel cars, pure electric cars, hybrid cars can not be used). When you"'"re ready to place an order, but you don"'"t know whether your car is compatible with the HUD, you can contact with us! We"'"re glad to help you!