Features: brand new and high quality 3.8-inch Large-screen Metal Nanotechnology: The front side adopts metal nanotechnology to eliminate unnecessary reflections and make the picture display clearer. Head-up Display Functions: Vehicle speed/acceleration per 100 kilometers /altitude/driving for time/driving mileage/Beijing for time/driving direction/speeding alarm/voltage icon fatigue driving reminder. One-key Switching of Multiple Screens: Manually set the driving data you need to display, and the button operation is convenient, you can switch the mode you want. GPS+Beidou Dual-mode Chip: Using 10 Hz high refresh rate GPS+Beidou dual-mode chip, the rate is 10 frames/s, and without delay. USB Power Supply with Zero Power Consumption: Using car USB (5V) or cigarette lighter to USB power supply, truly zero power consumption. USB or cigarette lighter is a short power, while OBD is a long power. Alarm Function Improve Driving Safety: Set different parameters to alarm when the parameters exceed the limit, and sound alarm to improve driving safety. HUD Automatic Power on and off: HUD automatically power on and off as the car starts and stops. The PC material is resistant to high and low temperatures, even if the car is high in summer, the HUD will still operate normally. Specifications: Material: ABS Screen Type: LCD Head-up Display Interface Power Supply: OBD Appearance Size: approx. 90x55x30mm/ 3.54x2.17x1.18in Screen Type: LED Input Signal: GPS Screen Size: 3.8 Inches Package Includes: 1x Car HUD 1x USB Line 1x Non-slip Mat 1x Reflective Film 1x Instructions note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.