Description: Adaptive light sensitivity: Adaptive light sensitivity, brightness changes naturally with the environment, all weather, all environment, clear display, driving without glare. Convenient:HUD can switch speed, time, number of satellites, mileage, and travel time, USB power supply 0 power consumption, completely power off with the car turned off, no theft of electricity present,Satellite automatic timing, with no difference in minutes or seconds, unaffected by weather or natural factors. 2 major alarm functions: 1. Overspeed alarm; 2. 4 hours of continuous driving rest reminder. Automatic switch on/off: automatic start and stop with the car Multifunctional: Universal compatibility with car electronics accessories. Easy-to-install: Durable and minimalist head-up display. Materials: Overspeed feature for accurate speedometer readings. Specification: Color: black. Material: ABS,PC. Size: Approx 14.3 cm *9 cm *5.1 cm/5.63*3.54*2.01inch. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package Includes: Host 1USB Cable 1Double-sided Tape 1English Manual 1paper Box