Features: GPS speedometer: collecting real time speed from GPS satellites Driving time and distance calculation and display Plug & play: Power through vehicle cigarette outlet jack, no professional installation is required Bracelet holder include. Display MPH or KM/h - Simple push button set up Auto adjust brightness through sensor for day & night-time driving Over-speed warning: 3-second alarm beep and display flash will warn driver 93 beeps for over speeding alert) Alarm mute function Universal: compatible with all cars, trucks, bikes, & motorcycles. Specifications: Package size:16.5x10x10cm Package weight:100g Mode A: Single Display Mode - Only speed in full screen Slide the toggle switch up and hold to see the driving speed only, repeat to see full information display. Mode B: Multifunctional Display Mode - Speed, Single Driving Time, Single Driving Mileage, and Car Voltage. Slide the toggle switch down and hold to see time display at the bottom right corner, repeat to see altitude display. Package list: 1X HUD Head Up Display 1XBracket 1xUSB 1xFixing bracket