See How Nike+ Works >>NIKE + iPod® SENSOR & RECEIVER KIT :: Pick your mix and motivate your run. Nike + lets you listen to tunes while you track your progress on your iPod® nano. Simply slip the Nike + sensor into your Nike + ready shoe and head out. The sensor turns on automatically when you walk and then transmits audible performance feedback through your headphones. Track speed, distance, pace and calories; and then use your computer to upload the data to nikeplus.com and view your progress.