If your current sensor has been lost or exhausted its battery, get the Nike+ iPod® Stand Alone Sensor Kit. It's also a great choice if you want an extra sensor for a second pair of Nike+ shoes. Works with your Nike + iPod® Sport Kit to track your runs. 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.
CAN I BUY THE STAND ALONE SENSOR IF I HAVE NEVER BOUGHT THE SPORTS KIT? I AM BUYING SOME NIKE+ SHOES AND I HAVE AN IPHONE4. SO DO I JUST NEED THE SENSOR? THANKS