NIke Plus + iPod Sport Kit Sensor Receiver Apple nano | #134396737
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Bean Pod 2 Pk: Universal Nike+ iPod Sensor Holder - Nike Plus iPod Sensor Cases, Works w/ All Shoes: 1 Red Sensor Shoe Pouch and 1 Blue Sensor Shoe Pouch | Amazon
Nike + iPod Sport Kit Gathers Running Workout Data - The New York Times
Nike iPod Sport Kit Wireless Running Shoe Sensor for sale online | eBay
Nike iPod Sport Kit Wireless Running Shoe Sensor Ma692ll/f for sale online | eBay