1. Collect real time speed from GPS satellites 2. Driving time and distance calculation and diasplay 3. Play and plug: power through vehicle cigarette outlet jack, no professional installation is required 4. Display MPH or KM/h: simple push button set up 5. Auto adjust brightness through sensor for day and night-time driving 6. Over-speed warning: 3s alarm beep and display flash will wran driver 93 beeps for over speeding alert
