A900 Auto Hud Display Car Projector Alarm EOBD OBD2 Head Up Display Speedometer Windshield Electronic AccessoriesPlease read carefully before placing an order:1. If your car is pre-2004 (for US automakers) and pre-2008 (for European/Asian automakers), the protocol is not compatible.2. After receiving the package, please test it on your car as soon as possible. If you do not want to keep the device after testing, you can also contact us to return it for a full refund3. According to customer feedback, it is not compatible with some special vehicles, such as electric vehicles, diesel vehicles, hybrid vehicles, pickup trucks, passenger cars, etc. If you still have questions, please contact us before buying, preferably tell us your car make/model/year/agreement before buying.A900 HUD Car Head Up DisplayNote:OBD System Only Compatible With Petrol Car ,Not compatible With Diesel Car Electric Car hybrid vehicle.HUD Main Functions & FeaturesA. OBDII cable input : a. Up button = up motionB. Power button : b. Ok button = inward button pressesC. Setting button: Three ways of setting button : c. Down button = down motion1.Engine RPM2.Water temperature icon3.RPM unit4.Alarm (On/Off Option)5.Speed unit at KM/H6.Speed unit at MPH7.Voltage icon8.Multi-function area: speed, water temperature, voltage9.Light sensor (Automatically adjust the brightness according to the environment)Head-up displayFront View HUD You can view navigation and information at eye level instead of looking down repeatedly to ensure safer drivingPackage List:1* HUD body,1* OBD data line,1* reflection film,1* anti-slip mat,1* English Manual