GPS Speedometer Display - The latest version has a large 3.5" screen that shows the most important MPH data and mileage/direction/speed progress bars. Satellite speed is displayed accurately and the compass on the right gives you all the directional data you need while driving. Driving Safety Reminder-What is the most important thing to drive? As we all know, life safety comes first, speeding and fatigue driving are not allowed, our car speeding alarm HUD has two important reminders, speeding reminder and fatigue driving reminder, when the speed exceeds the value you set, it will send out The ticking sound reminds you to slow down; if the driving time exceeds 4 hours, it will remind you that you need a short rest. It is a considerate safety steward during the journey. High-definition data display - equipped with an automatic light-sensitive screen, no need to manually adjust, it will automatically adjust the most suitable display brightness according to the external light, so you can get the clearest data no matter day or night, no need to worry about too strong sunlight to watch Unclear display problem. EASY TO USE AND GUARANTEED - One button operation, long press for 3 seconds to enter the setting menu, short press to switch display modes, toggle the scroll wheel to the left or one key to the right to switch display modes. Technology processing chip - the built-in chip of the digital GPS speedometer has super performance and compatibility, dual-running memory and dual-core processors ensure the smoothness of high-speed operation, provide data assistance for your car travel life, and effectively reduce problem data delays. Track the driving speed in real time. Warm Reminder - Since most HUDs GPS speedometer displays on the market, they can only display the current driving distance. Because it runs on the car's power supply, it cannot retain previous distance data when the car is turned off, nor can it accumulate total distance traveled while the power is out. The speed unit KM/H and MPH can be switched freely - how to switch the speed unit? 1. Press and hold the Jog Dial vertically for 3 seconds to enter item 1 (1-6). 2. Turn the scroll wheel left and right to switch to item 5, then press the scroll wheel vertically to enter the speed unit setting, turn the scroll wheel left and right to switch the speed unit ("1" is MPH, "0" is KM /H) 3. Vertical Press the Jog Dial for 3 seconds to save and exit.