OBD HUD Function: Vehicle speed, RPM, water temperature, voltage, fuel consumption time, turbo pressure, single driving distance, single driving time, acceleration speed measurement for 100 kilometers Alarm: overspeed alarm, speed alarm, water temperature alarm, voltage alarm, fault code alarm, fatigue driving reminder alarm Feature: With a color changing ambient light at the bottom Display functions: 1. Satellite : After the satellite is found, the GPS light stops flashing and stays on for normal use. 2. Vehicle speed display 3. Compass: N (North) E (East) W (West) S (South) 4. Speed unit: KM/H (kilometers) MPH (miles) Color:Black Material:ABS Package Contents: 1 * Car Heads-up display 1 * OBD Cable 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.