Plug and play. HUD can auto adapt to vehicle type which in line with OBDII or EUOBD(On-Board Diagnostic System). Comprehensive display. HUD can display many parameters at the same time as follows, vehicle speed, engine speed, water temperature (voltage, throttle valve position, ignition advance angle, time of 100 km acceleration),fuel consumption, mileage, low fuel tips, engine failure. Diversiform display mode. Driver can chose normal display mode, high- speed display mode and automatic display mode. Free switch. Km and mile can be switched freely to meet the need of each auto meter. Suitable size. The display area is 5.5 inches which is very clear for driver to read data. Automatic power on and off. Starting with the vehicle starting, stopping with the vehicle stopping to protect the vehicles battery. Moreover, we pre- serve the hand switch function to control the HUD. Flexible alarm mode. HUD can offer single-stage and four-stage overspeed alarm modes to choose to make driving safer. Engine speed alarm. It contributes to shift gear in time to save fuel also has significance to new driver. Flexible brightness adjustment. The brightness can be adjusted automatically or manually to reach the best state which is in harmony with the environment. Display information: car speed, engine speed, water temperature voltage throttle position ignition advance angle 100 km acceleration time instantaneous fuel consumption average fuel consumption detection fault code elimination fault code Alarm: Overspeed (single-segment/four-segment) alarm Water temperature alarm Voltage alarm Shift reminder Fatigue driving reminder colour:colorful Material:ABS+PC size:135*80*15mm Package Contents: 1 * Host 1 * OBD Cable 1 * Reflection Film 1 * Anti-slip Mat 1 * Chinese and English instruction manual 1 * box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.