SpecificationBrand GEYIRENName Car OBD2 Head Up DisplayColor BlackSize 86x37x25mmFunction 1 Multifunction Speed Water temperature Voltage 2 Short Press To switch voltage water temperature vehicle speed enter into menu setting to switch menu options or parameter values Long Press To enter into menu settings see instructions for Menu 1 12 and press 5 seconds to save and exit 3 Short Press Menu and parameter value Long Press To turnon and off the buzzer default choice is buzzer on you can freely choose to turn on or off 4 Engine icon Water temperature icon 5 Voltage icon Fatigue driving icon 6 Speed unit MPH mile 7 KM H kilometer 8 OBD connection port 9 Short Press Menu and parametersvalue Long Press Long press till the screen is all on and the fault code is eliminated long press again to exit 10 Power switch Long press for 5s to turn off again to turn on Features it will automatically alarmif overspeed so it can save youfrom looking down the speedometer and drive safely Hud can automatically adjust the brightness according to the environment Display Windshield Digital Car Speed Projector On BoardComputer Fuet Mileage Alarm TRIP means the driving distance from engine start to off Perfectly compatible with vans trucks buses cars off road vehicles SUVs and other vehicles Easy to install plug and play How to Install the HUD Car Computer 1 Insert the product into the check port on the vehicle OBD computer 2 Insert the other end of the product in