Features: Speed alarm, fatigue driving reminder function, improve driving safety. Low-power chip, non-destructive standby completely solves the problem of high power consumption! Intelligent switch machine, start and close with the car. Nano-technologyto eliminate LCD,more clear. Auto power on/off: HUD start and off with vehicle started and shutdown, effective for protection of the car battery; retaining the manual switch mode,more easy to control HUD. Automatic and manual brightness adjustment mode,driving without for glare. Plug and for play, suitable for most for cars. Specifications: Material:ABS+PC Size: Approx.5.2x5.2cm/2.04x2.04inch Color:Black Package Includes: 1x Host 1x USB Cable 1x Manual 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.