GPS Speedometer Display: Extra large 5.5 inch screen can display the most important MPH data and driving time/mileage/time/direction at the same time, two scales show the speed and the number of satellites respectively, the compass in the middle gives you the direction, satisfying all your data needs during the driving process Driving Safety Alert: What is the most important thing about driving? As we all know, life safety is the first, speeding and fatigued driving are not allowed, our car overspeed alarm HUD has two important reminders, speeding alert and fatigue driving alert, when the speed exceeds your set value, it will emit a ticking sound to remind you so as to reduce the speed; driving time over 4 hours will remind you to need a short break, a caring safety butler during the journey HD Data Display: Equipped with an automatic light-sensitive screen, no need to adjust manually, it will automatically adjust the most suitable display brightness according to the external light, whether in the daytime or at night you can get the clearest data, no longer worry about the problem of not being able to see the display when the sun is strong Technology Processing Chip: digital GPS speedometer hud build-in the chip super performance and compatibility, dual-running memory, and dual-core processor to ensure smooth high-speed operation which offers the data to help your car travel life, effectively reducing the problem of data delay, real-time follow up driving speed Easy to Use: One key operation, press for 2 seconds to enter the setting menu, short press to switch the display mode, left to switch the speed and driving direction angle, right to switch the time, number of satellites, driving distance, driving time, etc. Warm Tips: As most of the HUDs GPS speedometers on the market show, they can only show the current mileage driven. Because it depends on the car power supply to work, it can't keep the previous distance data when the car is turned off, and can't accumulate the total distance driven with the power off. Brightness Auto-sensitive & Manual Adjustment: The default setting is auto-sensitive brightness. How to get the highest display brightness? 1. long press the wheel button to enter the setting menu. 2. short press the wheel button to enter the 4th setting, and adjust the value to "11" to achieve the highest brightness. 3. short press once to confirm the setting. Since the sensor brightness is adjusted by the light level of the small hole on the back of the display, when the sensor hole is blocked, the brightness will be reduced.