GPS speedometer display: super 5.5-inch screen, which can display the most important data and driving time/mileage/time/direction at the same time. all data requirementsDriving safety warning: As we all know, life safety is the first priority, speeding and fatigue driving are not allowed, car speeding alarm HUD has two important reminders, speeding reminder and fatigue driving reminder, when the speed exceeds the value you set, it will It will make a ticking sound to remind you to ; if the driving time exceeds 4 hours, it will remind you that you need a short rest, and the considerate safety steward during the journeyHigh-definition data display: Equipped with an automatic photosensitive screen, no manual adjustment is required, the most suitable display brightness will be automatically adjusted according to the external light, the clearest data can be obtained no matter day or night, no worry about the problem of not being to see the display when the is strongTechnology processing chip: digital GPS speedometer hud has a built-in chip with super performance and compatibility, dual-running memory and dual-core processor to high-speed operation, data for your car travel life, effectively reduce data delay problems, and up the car in real time speedEasy to use: One-button operation, long press for 2 seconds to enter the setting , short press to switch display mode, left to switch speed and driving direction angle, right to switch time, number of satellites, driving distance, driving time, etc.Reminder: Since most HUDs on the market have GPS speedometer displays, they can only display the current mileage. Because it works on the power of the car, it cannot save the previous distance data when the car is turned off, nor can it accumulate the distance traveled when the power is off.Brightness auto-sensing and manual adjustment: The default setting is auto-sensing brightness. How to the highest display brightness? 1. Long press the scroll wheel to enter the setting . 2. Short press the scroll wheel button to enter the fourth setting, and adjust the value to "11" to reach the highest brightness. 3. Short press to confirm the setting. Since the sensor brightness is adjusted by the light level through the small hole on the back of the display, when the sensor hole is blocked, the brightness will be reduced.color:BlackMaterial:plasticPackage Contents:1 x Heads up display for carOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.