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. Car Display has two alarm functions, which can set overspeed alarm and remind you of fatigue driving for 8 hours continuously. Energy-saving: Time-LCD Display is powered by USB, and completely powered off with the vehicle flameout, with-zero power consumption. Two Style Options: Mobile Head-UP Display with white-light and green light. It is still visible in day or night. Specifications: Material:ABS Size:Approx.5.2x5.2x1.4cm/2.04x2.04x0.55 Color: Green Light/White-Light Applicable model: general Function: speed, direction, number of stars searched Alarm: overspeed alarm, fatigue driving alarm Package Includes: 1x HUD Head Up Display 1x USB Cable 1x Sucker Support 1x Instructions 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. Thanks for your understandings.