MULTIPLE FUNCTIONS When HUD power on, the screen flickers. "+" to choose GPS or OBD system. After 5 seconds without operation, it automatically enter the last system. Multiple functions:Speed,water temperature,voltage,satellite numbers,driving distance RPM : Engine speed in OBD mode, and speed progress bar in GPS mode. for Water temperature and battery voltage Speed unit:KM/H=kilometer/hour, MPH=Mile/hour Attention: The OBD2 mode are not compatible with following cars: European and American cars manufactured before 2008 and Asian cars manufactured before 2008. American cars produced before 2008 and all , , Sail, cars. France cars manufactured by FAT,,,,,Simka, Amirka Japanese cars: for , for , for (QX50, Q50, Q501), for avanza 2013, for (is250, ex250, ES300H), for (jazz, ) are not compatible. And all Japanese cars before 2008 are not compatiable. Some models of and cannot use this OBD2 HUD (2013 for , 2017 for Soul PS, etc.) Oil-electric hybrid and some vehicles cannot use OBD2 HUD, GPS HUD are recommended. Pickup Trucks and Modified ECU vehicles are not suitable for this HUD. GPS mode compatible with all vehicles. If you are not sure this product is suitable for your car or not Color: Black Material: plastic Package Contents: 1 * HUD 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.