GIYO M3 LCD Display Bike GPS Cycling Computer Wireless Road Bicycle Stopwatch Velocimeter(White)1. Built in high sensitivity GPS chip, no need for additional peripheral sensors, accurately calculate mileage and speed, and automatically calibrate the time base according to the time zone you choose 2. 1. 7 inch high definition LCD screen, full screen backlight design, you can clearly see the data no matter in the sun or night riding, no longer have to worry about the dark 3. USB rechargeable, can be charged with any charging device with USB DC 5V