Features 1. GPS speedometer display: The large 5.5-inch screen can simultaneously display the most important MPH data and driving time/mileage/time/direction, with two scales displaying speed and the number of satellites respectively. The middle compass provides direction for you, meeting all your data needs during driving. 2. Driving safety alarm: Our car overspeed alarm HUD has two important reminders: overspeed alarm and fatigue driving alarm. When the speed exceeds your set value, it will emit a ticking sound to remind you and reduce the speed. Driving for more than 4 hours will remind you of the need for a short rest, as a thoughtful safety manager during the journey High definition data display: Equipped with an automatic photosensitive screen that does not require manual adjustment, it will automatically adjust the most suitable display brightness according to external light, and can obtain the clearest data whether during the day or at night, no longer worrying about not seeing the display screen in strong sunlight. 3. Easy to use: One click operation, long press for 2 seconds to enter the settings menu, short press to switch display mode, left click to switch speed and driving direction angle, right click to switch time, number of satellites, driving distance, driving time, etc. 4. Automatic brightness sensing&manual adjustment: The default is automatic brightness sensing. As the brightness of the sensor is adjusted through the brightness of the small hole on the back of the display screen, the brightness will decrease when the sensor hole is blocked. 5. Technical processing chip: The built-in chip of the digital GPS speedometer hud has strong performances and compatibility, dual running memory and dual core processor ensure smooth high-speed operation, provide data to help your car travel life, effectively reduce data delay issues, and track driving speed in real time. Specification Material: ABS Color: Black Size: 17 x 8 x 6 cm Weight: 170 g Package Include: 1x G3- Head Up with Display 1x USB line 1x Anti slip double-sided tape 1x Instructions