A bargain for this nifty little device, £17.99 at Play £21.99 at Amazon. Online only
One bit attaches to your shoe the other to your ipod nano to record distance, min miles calories etc. I dont use mine with an official nike+ shoe you can buy pouches off ebay for about £5 that attach to any shoe. Upload your run data to Nike+ or other sites which read your runs eg this was my run yesterday.. http://www.runnerplus.com/run/6903-635602/
* Transform your iPod Nano into a personal workout coach with the Nike+ iPod Sport Kit. This wireless sensor and receiver combination works exclusively with your Nike+ shoes and iPod nano to give you real-time feedback during workouts and let you track your performance on your Mac or PC.
* Operating instructions included.
* Contains wireless sensor for Nike+ shoe and wireless receiver for iPod Nano.
* Requires iPod Nano, Nike+ shoes, iPod Nano software v1.2 and iTunes 6.0.5 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.com account.