Feature: 1. Head-up display - projects the driving speed on the windscreen; 2. Stand-up display - shows the driving speed on the LED screen. 3. Easy Setup-Plug & Play- Power through vehicle cigarette lighter. No professional installation is required. 4. Compatible with all Cars & Trucks. Use GPS signal guided calculation. No wiring needed to the VSS (vehicle speed signal). 5. Display MPH or KM/H. 5. Driving time and mileage calculation display. 6. Auto adjusts brightness through sensor for Day & Night driving. 7. Green color speed display, easy on your eye. 8. Over-speed Alarm, and On/Off.