E300 OBD2 HUD Gauge Car Electrical Appliances Head Up Display Projection for Car Gla Digital Speedometer Electronics Speed 1.Fuel consumption: average fuel consumption per 100km, instant fuel consumption.2.Brightne sensor: Changes the units display brightne to suit the constantly changing environment whilst driving.3.Alarm icon panel: From left to right, buzzer, shift reminder, fatigued driver reminder,engine fault.4.Rotational speed: Indicates the rotational speed of the engine.5.Rotational speed units: indicating the units of rotational speed.6.Unit mark of speed:- KM/H = Kilometers/hour- MPH = Miles/hour7.Speed: Live speed8.Unit mark: From Left to right- KM = Kilometers- V = Voltage- M = Miles- Degrees (Celsius or Fahrenheit)9.Multifunction display window: Voltage, Mileage, Water temperature.10.Secondary Alarm icon panel: From top to button,speed alarm, battery voltage alarm, Engine temperature alarm11.speed alarm icon12.Fuel consumption unit mark:- L/100km = Liters/100 kilometers,- L/H = Liter/hour Auto-match models, plug and play According to OBD or EUOBD,( the on-board auto-matic diagnosis system) plug and play.- Judgment method:Open and find the sticker under the hood.lf OBD2 CERTIFILE can be installed (as shown in Figure 1)Or check whether there is an automobile diagnosis port under the steering wheel (as shown in figure 2)(u.s. cars can be used after 2003 and most other cars after 2007.) Package Included: 1 X head-up display