Nike+ iPod Sport Kit (NEWEST VERSION) [Retail Packaging] What's in the Box - Wireless sensor for Nike+ shoes, Wireless receiver for iPod nano, Printed documentation Insert the wireless sensor inside the custom, built-in pocket beneath the insole of your Nike+ shoe, then plug the receiver into the Dock connector on your iPod nano. The iPod touch (2nd generation) and iPhone 3GS includes built-in support for the system - no receiver necessary. Now start your workout. As your run or walk, the sensor sends information to your device, tracking your time, distance, pace, and calories burned. If you choose, real-time, spoken feedback can even alert you to milestones throughout your workout. Back at your computer, sync your iPod or iPhone 3GS to transfer your workout data to iTunes and Nike website. There, you can evaluate your performance history, set goals, and even challenge other runners to a virtual race. Requirements - iPod nano, iPod touch (2nd generation), or iPhone 3GS, Nike+ shoes, iTunes 9.0 or later (available via free download), A Mac with a USB 2.0 port and Mac OS X version 10.3.9 or later; or a PC with a USB 2.0 port and Windows 2000 (SP4) or XP Home or Professional (SP2), Internet access and a free Nike account