1.1. HUD Functions: Vehicle speed, speed alarm, fatigue driving alarm, driving millage, number of satellites, etc. Decorative atmospheric lights make your car more decorated. The GPS compass always shows you the advanced direction. The semi -ARC three -dimensional design makes the body more round and can be placed anywhere. 2.2. HUD Switch: It has a 14mm field visual effect depth that gives you a clearer and more three -dimensional area during driving. In addition, it has automatic sensitivity that can automatically adjust the screen brightness according to the current ambient light brightness. This product operating voltage is 5V and it is forbidden to use a voltage higher than 5V for power supply. Normally this device can be used in all cars. After the HUD is opened, the satellite icon flashes, which stops searched for satellite signals, the icon stops flashing and displaying the number of satellites can be used normally. Finally, connect the USB cable to HUD and place the HUD in a suitable position. It is very easy to install, take a few minutes to complete.