Doumneou Automatic power . Starting with the vehicle starting, stopping with the vehicle stopping to the vehicle?s battery. Moreover, we - the hand switch function to control the HUD. Flexible alarm mode. HUD can offer single-stage and four-stage overspeed alarm modes to to make driving . Engine speed alarm. It contributes to shift gear in time to save 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 100 km acceleration time instantaneous consumption average 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 * 1 * OBD Cable 1 * Reflection Film 1 * Anti-slip Mat 1 * Manual 1 * box Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.