Features: Compact and Portable: HUD Head Up Display compact body, no matter where it is placed, is clear and natural, without blocking any-vision. LED Screen with Automatic Adjustment: Vehicle HUD Display has high-definition LED to automatically adjust the screen brightness according to the current ambient-light, bringing a comfortable visual experience. Multi-functional Design: Car GPS Tachometer accurately displays the speed, adds the speed calibration function, and can be adjusted to be consistent with the display of the car dashboard. GPS precise positioning is not affected by the weather. Energy-saving: Time-LCD Display is powered by USB, and completely powered off with the vehicle flameout, with-zero power consumption. Automatic and manual brightness adjustment mode, driving is not dazzling. Multi-color screen design makes the picture richer and easier to read. Specifications: Material:ABS+PC Size:Approx.9x5.5x3cm/3.54x2.16x1.18inch Color: Black Model: M17 Rated-power supply: 5-12v Wired or wireless: wired Functions: speed, speed, overspeed alarm, water temperature, etc., oil consumption display, water temperature. Alarm: overspeed, engine failure, water temperature and voltage. Cable length: 1.8M Installation: connecting OBD port Note: .Please allow 1-2cm errors due to manual measurement, 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. Thanks for your understandings. Package includes: 1x HUD Head Up Display