Apple Nike + iPod Sensor remote control

Nike + iPod Sensor Sport Kit
This wireless sensor works with your Nike + iPod Sport Kit 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.
This sensor is 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 sensor for a second pair of Nike+ shoes.