【About M11 HUD】The model of this product is M11,it is a reflective car flat screen display,unlike intuitive displays,this display is able to show the car's driving data on the window,the HUD has an adaptive light sensor function,which reduce the ghosting and no blurring,it's very convenient to watch. 【Multiple alarm modes】Head up display for car windshield speedometer for car with overspeed alarm,voltage alarm,water temperature alarm,fatigue driving reminder,fault alarm. 【OBD main function】Windshield speedometer projector OBD mode function: hour speed speed speed bar water temperature voltage single trip mileage clear fault code over speed alarm speed alarm water temperature alarm low voltage alarm fatigue driving reminder. 【GPS mode function】Car heads up display windshield GPS mode function: speed speed progress bar voltage satellite number driving direction single driving distance over speed alarm voltage too low alarm. 【Easy to install】Our product is easy to install, plug and play, just use the usb cable included in the product to connect the car and the product, start the engine to power on and use. The installation can be completed in a short time and hardly any mechanical knowledge is required. 【Note】The OBD system is only applicable to gasoline vehicles after 2009,while the GPS system is applicable to all vehicles. Please switch to the GPS system for other vehicles. This product is only applicable to vehicles with OBD2 protocol and EU-OBD protocol (after 2009). This product does not support JOBD and OBDI. The OBD model is not compatible with hybrid electric vehicles, diesel vehicles, pickup trucks, RVs, and computer modified vehicles. The following brands are not compatible with the OBD2 system: Renault/Peugeot/Citroen/Fiat/Jeep/Dodge/Jazz/RV/Hummer,etc. (Note: If you want to use OBD mode but are unsure if your car is compatible with OBD,please confirm with us before purchasing.) M11 car windshield display is a flat panel display with dual OBD+GPS systems. Car head up display unlike most flat panel displays on the market, our designers have made good use of the windshield and turned M11 hud display car into a new windshield HUD.Hud for car windshield has many functions that can protect you. hud speedometer can automatically display brightness for clear visibility. speed projector for car is a great head up display for car.