Multi functional display: vehicle speed, water temperature, voltage, mileage Engine malfunction diagram, water temperature Voltage fatigue driving MPH speed in miles (km/h), MPH mile (mph) using:Restore factory settings:Unplug the power' and hold the 'M' key, do not release it. After plugging in the power, the screen light up completely, and then release the 'M' key to restore the factory settings Switch alarm sound:After the HUD displays normally, long the '-' button for 3 seconds to turn off the buzzer, and long the '-' button again for 3 seconds to turn on the buzzer Automatic stop or oil electric hybrid: and hold the M key for 3 seconds to enter the settings. In the 10th option of the settings, set the shutdown voltage to 1. and hold the M key for 3 seconds to save and exit Enter setup mode:When setting up, please watch the image on the windshield for operation. Long the 'M' key for 3 seconds to enter the setting items (1-12), and the menu display: 1. Use the '+' key to add menu options, short the M key to enter parameter values and flash, short the '+' or '-' key to adjust parameter values, short the M key to return to the menu, long the M key for 3 seconds to save and exit (The product appearance and printed words depending on the batch, but this does not affect use) Color: As shown Material: plastic Package Contents: 1 x M3 OBD2 HUD Car Projector Display 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.