Description: GPS Speedometers: Use GPS signal guided, compatible with all vehicles. Hud Head Up Display: Head-up display the vehicle driving speed, and calculation and display driving time and mileage, green color speed display, easy on your eye. Speed Unit: Drving speed is displayed by KM/H and MPH. Long press the Enter Button, if you see number 100 shown on the screen, which means the speed unit is KM/h, if you see number 161 shown on the screen, which means the speed unit is MPH. Functions: Over-speed alert, settle the over-speed value, once over value, it will give a warning. Easy to Install: Easy setup, power through vehicle cigarette lighter adapter, plug and play, first time usage, it takes 2-5 minutes to receive GPS signal. Specification: Material: ABS Plastic Size Chart: C60s: 6.5x3cm/2.56x1.18inch C80: 10.5x6x1.5cm/4.13x2.36x0.59inch Package Includes: 1 Piece Car GPS Speedometer 1 Piece Mount 1 Piece Charging Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!