GEYIREN A8 HUD Head-Up Display OBD2 EOBD Speeding Alarm Water Temperature Projector Windshield Fuel Consumption Car AccessoriesWhy using Head-up display is great?Glancing down or to the side to see the navigation can be potentially dangerous.Car Speedometer AlarmTo Avoid Get Tickets,HUD Will Giving Alarm When You Are Speeding Have You Ever Been Met These ProblemsYou may like to apply a transparent reflective film onto your windshield if you see that your cars windshield tends to blur the projected image Device Working Temperature -40-80its made of high quality ABS+PC4 Differents Display Interfaces A8 Function Describe 1.Light sensor:Automatically adjust the brightness according to the environment 2.Rotational speed(RPM): the rotational speed of the engine. 3.Speed 4.RPM unit 5.Rotational speed units: the units of rotational speed 6.Water Temperature 7.Voltage 8.Fuel Consumpation(L/100KM) 9.Unit mark: Degrees (Celsius or Fahrenheit F), KM = Kilometers, V = Voltage, M = Miles 10. Fuel Consumpation Signel 11. Fuel consumption unit :L/100km = Liter/100 kilometers, L/H = Liter/hour 12. Multi function display: Voltage, Mileage, Water temperature.A:Setting Button B:Power button C:OBDII Cable Inport A8 Details Locate the 16 pin diagnostic link (see below picture). This is usually located in the area under the steering wheel.