Features: Large screen and vehicle speed display: With a large screen design, making it convenient for drivers to view. Real time display of the current speed of the vehicle, helping drivers to grasp the driving speed and improve driving safety. High-definition LED, clearly visible day and night. USB power supply 0 power consumption: When the vehicle is turned off, the power is completely cut off, and there is no power theft. GPS+Beidou Dual Chipsets: Using 10Hz high refresh rate GPS + Beidou dual-mode chip. The refresh rate is 10 frames per second, the speed of the vehicle is fast, and there is no delay. Accurate speed display: Add the speed calibration function, which can be adjusted to be consistent with the display of the car dashboard. Non-destructive installation: Plug and play. Connect the USB cable to the USB port. Specifications: Item: Heads-Up Display Material: ABS Main Color: Black Unit: MPH/KMH Screen Size: 2.8 Inch Size: 80*54*31mm Package Size: 14.3*9*5.1cm Package Weight: 140g Package List: 1* Heads-Up Display 1* USB Cable 1* Non-slip Mat 1* User Manual