Features: Multi function display:Current speed,Mileage,Driving direction,Automatic sensitization,Sound alarm,Speed Alarm,Fatigue driving reminder,Driving speed(KM/h or MPH). GPS precise positioning / real-time synchronous data display, satellite data acquisition, not affected by the weather. 2 major alarm functions to improve driving safety,Speed Alarm and Fatigue driving reminder. Automatic photosensitive mode, automatically adjust the brightness of the display according to the intensity of external light to make it clearly visible under strong light. Automatic start-up and shutdown with vehicle start-up and shutdown. Specifications: Color:Green,White for optional USB (5V) can be used. package weight: 145g package size:9x9x6cm Package List: 1xHead Up Display 1xInstructions 1XNon-slip mat 1XUSB