receiver required. This wireless sensor works with your iPod nano, iPod touch (2nd generation), or iPhone 3GS to track your workouts. Insert it into the built-in pocket beneath the insole of your Nike+ shoe and pair it with your existing Nike + iPod receiver attached to your iPod nano.If you have an iPod touch (2nd generation) or iPhone 3GS, all you need to track your workouts isthis wireless sensor. With its built-in support for Nike + iPod, your iPod touch (2nd generation) or iPhone 3GS can deliver all the benefits of the Nike + iPod Sport Kit without the extra receiver.This sensor is also perfect as a replacement for a sensor that has been lost or has exhausted its battery. Or it's great if you want to have a sensorfor a second pair of Nike+ shoes.Please note: This packag...  (less)