Apple MA368EABM

This wireless sensor works with your iPod nano, iPod touch (2nd generation or later), iPhone 3GS or later, to track your workouts. Insert it into the built-in pocket beneath the insole of your Nike+ shoe and pair it with your existing Nike + iPod receiver attached to your iPod nano. The Nike+ Sensor makes it easy to track your time, distance, pace and more while you run. Afterward, upload your run data to Nikeplus.com, the world's largest running club, where you can monitor your progress, join challenges, map your runs and connect with friends.