1. Head-up display the driving speed.2. Driving time and mileage calculation and display. 3. Over-speed alarm setting. 4. Fatigue driving alarm. 5. Altitude display. 6. Local time display with auto timezone adjustment. 7. 6.2 Inch Large size screen. 8. Easy Setup-Plug & Play-Power througn vehicle cigarette. 9. Compatible with all Cars & Trucks.Use GPS signal guided calculation.No wiring needed to the VSS(Vehicle speed signal). 10 Display MPH or KM/h. 11. Auto adjust brightness througn sensor for Day & Night driving. 12. Green color data display,easy on your eye. 13. Total mileage display after car stops.