Apple and Nike has teamed up and released the Nike+iPod package, which allows for using an iPod Nano as a pedometer and share the training information online. It is based on a wireless accelerometer (1.37 x 0.95 x 0.30 inches, 0.23 ounce, using a proprietary protocol at 2.4GHz) and a receiver that connects to the iPod (Size: 1.03 x 0.62 x 0.22 inches, 0.12 ounce). Suggested price is US$29, which is very cheap thinking about the included accelerometer.