Geyiren OBD2 EOBD HUD A900 Head-Up Display Car Overspeed Speed Alarm Auto Water Temperature Windshield Projector WEIYING HUD A900 Head-Up Display Car Accessories OBD2 Overspeed Warning Windshield Projector Alarm AutoA. OBDII cable input :a. Up button = up motionB. Power button: b. Ok button = inward button presses C. Setting button: Three ways of setting button : c. Down button = down motion 1.Engine RPM 2.Water temperature icon 3.RPM unit 4.Alarm (On/Off Option) 5.Speed unit at KM/H6.Speed unit at MPH 7.Voltage icon 8.Multi-function area: speed, water temperature, voltage 9.Light sensor (Automatically adjust the brightness according to the environment) Head-up display Front View HUD You can view navigation and information at eye level instead of looking down repeatedly to ensure safer driving A900 Main Function Product Features: 1. WiiYii CAR 100% Brand Guarantee 2.Safty driving, Keep your eyes ahead, No need to down your head to see Dashboard while driving 3.Nano-technology to eliminate double reflections, more clarity 4. Easy to Install, Only need connect the HUD with Car OBD port by OBD cable, HUD will display when car engine on / off 5. Over-time driving Alarm, Low Voltage Alarm, Over-speed Alarm, High temperature Alarm, Engine faulty Alarm 6. KMH & MPH Switch Freely. 7. Compatiable for: Cars in OBD II Standard (after 2007 years)Diesel cars, pure electric cars, hybrid cars cannot be used 8. Installation position: On Center Console 9. Connection: Connect with Car OBD port 10.Display information:speed, RPM, water temperature, voltage, single driving distance, low voltage alarm, high water temperature alarm, over speed alarm, freely switch between kilometers & miles. 11.Multi-color design makes the screen clearer and easier to read 12. 5-level brightness adjustment, automatic and manual brightness adjustment mode Easy to install Step1: 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. short pull up to switch display mode mode 1: Speed + RPM mode 2: Speed + Water Temperature mode 3: speed mode 4: Speed+ RPM + Water Temperature Screen size:3.5 inch Incompatible models (will updated...)But you can choose our GPS HUD