Features: 6 Major Function Switching: Speed, Fuel consumption, acceleration time per 100 km,voltage, water temperature，current mileage. Five Alarm Functions: Overspeed alarm, RPM alarm, low voltage alarm, water temperature alarm,fatigue driving reminder. Hardware Upgrade:Using low-power chips, non-destructive repetition to completely solve the problem of high power consumption Intelligent switch, start and close with the car. Brightness Upgrade:It can be clearly displayed even when driving in the sun during the day. Software Upgrade:Add speed lubrication effect, no jump speed, more consistent and smooth display, and increase the compatibility of starting and stopping, hybrid vehicles, and gasoline vehicles. Auto-sensitivity Mode: Equipped with photosensitive elements, the brightness of the display is automatically adjusted according to the intensity of external light, so that it is clearly visible under strong light. Automatic Switch: Automatically turn on and off as the car starts and stops. Specifications: Color: Black Material: ABS Screen Size: 2inch System: OBDⅡ Product Size:63.8 * 61.7 * 47.1mm Package Weight: 145g Package Size: 14.3 * 9 * 5.1cm Package List: 1 * B1-HUD Main Unit 1 * OBD Line 1 * Non-slip Mat 1 * User Manual