今日喺us nike online store上左架，因為information太ambiguous好快又落返架。我見到係一條同polar一模一樣嘅strap，上面寫住nike+ Ready。
Serious runners are in tune with their body's rhythms and reactions, and in the Polar Wearlink+ (Medium-XX Large) Transmitter you'll know your inner athlete better than ever. This high-tech combination of sports and science allows you to track your heart rate with verbal or visual feedback and then analyze your beats per minute at nikeplus.com. Featuring seamless compatibility with the Nike+ Sportband and 5th generation iPodR nano, this Nike+ heart rate strap is the future of running.
For use with Nike+ device and Polar training computer at the same time
Coded signal ensures link between Nike+ device and heart rate signal
Machine-washable textile strap
User replaceable battery