Main function M1 displays speed, has overspeed alarm and fatigue alarm functions, and GPS compass displays direction. The speed has MPH and KM/H units, which can be adjusted in the settings. When the vehicle speed is too fast or the continuous driving time is too long, the product will beep to remind the driver, just like a safety supervisor, always reminding the driver to pay attention to driving safety. Placing a mini M1 HUD car in the car will definitely add a lot of fun. Automatic HUD 1 The product is embedded with advanced photosensitive elements, which can change according to the brightness. When the light is strong during the day, the product will automatically brighten. On the contrary, when the light is weak at night, the product brightness will also automatically dim. Automated HUD 2 The second benefit of automation is that the product automatically turns on when the car starts and automatically turns off after the car is turned off. It is very convenient and you dont have to worry about the product not being able to turn off. Warm reminder, if you dont drive for more than a week, please remove the product and put it in a drawer. Instructions Our product is easy to install, plug and play, just use the USB cable that comes with the product to connect the car and the product, start the engine and you can start using it. When you notice that the small icon on the product is constantly flashing, it means that the product is collecting satellites, and the speed will only be displayed when the device is searching for satellites. Note Please pay attention to the following three important information: In garages, overpasses and dense buildings, it will affect the search speed. When the same GPS device is installed on your car, it will also affect the speed of searching the product, which means: two GPS devices cannot be merged. When your car has a metal film, it will also affect the speed of searching the product.