Geyiren M3 OBD2 GPS Car Speedometer Head Up Display Speed Alarm HUD Water Temperature Windshield Projector MPH KM/H Weiying M3 Auto HUD OBD2 GPS Head-Up Display Car Projector Display Digital Speedometer For All Car OBD2 And EOBD Head-up Display, It supports over-speed alarm 1.Multi function: Speed, Water temperature, Voltage2.Short Pre the button "M"To switch voltage, water temperature,vehicle speed,enter into menu setting to switch menu options or parameter valuesLong Pre the button "M"To enter into menu settings (see instructions for Menu 1-12) and pre 5 seconds to save and exit3.Short Pre the button "-"Menu - and parameter value -Long Pre the button "-"To turn on and off the buzzer(default choice is buzzer on,you can freely choose to turn on or off)4.Engine icon, Water temperature icon5.Voltage icon, Fatigue driving icon6.Light sensor:HUD can automatically adjust the brightne according to the environment7.Speed unit: MPH- mile, KM/H- kilometer8.OBD connection port9.Power switchLong pre for 5s to turn off,again to turn on10.Short Pre the button "+"Menu + and parameters value +Long Pre the button "+"Long pre till the screen is all on, and the fault code is eliminated, long pre again to exit It supports all cars! It supports over-speed alarm! GPS Head-up Display 1.Satellite icon: After the satellite is found, it stops flashing and goes out before it can be used normally2.Light sensor: HUD can automatically adjust the brightne according to the environment3.Short Pre the button "M"To switch vehicle speed, satellite number, enter into menu setting to switch menu options or parameter valuesLong Pre the button "M"To enter into menu settings (see instructions for Menu 1-6) and pre 5 seconds to save and exit4.Short Pre the button "-"After entering the settings, Menu - and parameter value -Long Pre the button "-"To turn on and off the buzzer (default choice is buzzer on,you can freely choose to turn on or off)5.Buzzer6.Compa: N (North) E (East) W (West) S (South)7.Vehicle speed display: display the current vehicle speed8.Speed unit: MPH- mile, KM/H- kilometer9.OBD connection port10.Power switchLong pre for 5s to turn off, again to turn on11.Short Pre the button "+"After entering the settings, Menu + and parameters value +Long Pre the button "+"The screen is all on, and the fault code is eliminated, long pre again to exit Product Size Screen Size: 3.2 inchesDisplay Type: WindshieldProjectorDimension: 8.6x3.7x1.6cmSuitable for: OBD2 EUOBD and GPS CarsRated Power: 87.5-108mHZWire: 16-pin OBD cable or GPS USB Cable Package List: 1 x HUD1 x Manual1 x OBD Cable or GPS USB Cable1 x Reflective film1 x3M Sticker Please Note: OBD system is suitable for most cars after 2007 OBD2 model can work for OBD2 gasoline vehicles produced after 2004 in USA, and OBD2 gasoline vehicles produced after 2008 in other countries. OBD2 model is not applicable for the following cars: