"Straight from the brilliant minds at Nike and Apple, the Nike+iPod Sport Kit is the get-off-your-duff gadget of the decade; a product that seamlessly unites the near-universal obsession over health with consumer technology and the exploding world of digital audio entertainment. Nike and Apple have put forth a simple and inexpensive gadget that has the potential to inspire the listless, out-of-shape masses to break free from their keyboards and remotes and to engage in healthy physical exercise. The Nike+iPod Sport Kit is also a great tool for already-active runners, joggers and walkers who want to add some high-tech game to their exercise regimen." This is basically a high tech pedometer that interfaces with the iPod nano. You are supposed to use this along with special Nike shoes that have a place in the insole for the transmitter; however, the reviewer found that the transmitter will work with pretty much any pair of shoes, so at under $30 this seems like a heck of a deal.