Shoes send signal into air, for anyone to receive
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Nike plus + iPod Sport Kit - Wireless Connection - MA692LL/F, apple, new 91206207331 | eBay
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Put an IPod Nike+ Sensor in Any Running Shoe in One Minute for 5 Cents : 4 Steps (with Pictures) - Instructables
/cdn.vox-cdn.com/uploads/chorus_asset/file/12797987/nike_plus_basketball_training_shoes7_1020_gallery_post.1419970673.jpeg "Nike+ Training and Basketball: creating a game inside the game - The Verge")