Features: brand new and high quality Speeding alarm, fatigue driving reminder, improving driving safety, adding speed calibration function, adjustable to be consistent with the car dashboard display. Using 10 Hz high refresh-rate GPS + Beidou dual-mode chip, the vehicle refreshes quickly without delay. High-performance processing chip, strong performance and compatibility, dual-running memory and dual-core processor to ensure smooth high-speed operation. Using car USB or cigarette lighter to USB power supply, truly zero power consumption. GPS precise positioning, real-time synchronous display of data, satellite collection of data, not affected by the weather. It is equipped with a photosensitive element to automatically adjust the brightness of the display according to the intensity of the external light to make it clearly visible under strong light. Automatically switch the machine on and off as the car starts and stops. Specifications: Material:ABS Size: Approx.4.71x6.38x6.17cm/1.85x2.51x2.42inches Color: Green Light/White Light Package Includes: 1x Head-up Display note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.