The Velo 9 is CatEye&';s entry level wired 9 function bike computer made simple with pre-programmed tire sizes. Along with current, average, and max speed measurement, track your trip distance, elapsed time, and odometer Features auto start / stop for accurate measurements Pre-programmed tire sizes makes setup simple Large screen is easy to read Calorie consumption and a carbon offset measurement to help you track how much of a difference you are making Pace arrow Battery: 1, CR2032 Lithium Metal, 3(V), 0.735(Wh), 0.3g, Included