Make your Nike+ training experience even better. The Polar WearLink®+ Transmitter for Nike+ picks up your heart’s signals and transfers that data into the Nike+ system. The soft fabric chest strap seamlessly adapts to your body shape, bringing full freedom of movement to your training. With its hook mechanism, transmitter is just as quick to put on as it is to take off. Provides heart rate information to nikeplus.com web service with compatible Nike+ and iPod® mobile digital devices. Uses coded 5 kHz transmission, ensuring that your Polar training computer finds your heart rate signal. Includes a soft and comfortable hand washable fabric chest strap. Water-resistant connector. User replaceable battery.