The Polar WearLink+(R) transmitter Nike+ monitors heart rate and can be used with the iPod nano and iPod nano Multi-Touch 5th generation or later, Nike+ SportBand, Nike+ Sportwatch GPS or Polar training computers using 5 kHz data transfer. Thanks to this feature it can transmit heart rate data into the Nike+ system. The device is equipped with hook mechanism to quickly put it on or to take it off. The transmitter also features machine-washable soft textile strap and water-resistant connector. Its textile chest strap easily adapts to the user's body shape leaving full freedom of movement. When used with compatible Nike+ devices, the Polar WearLink+ transmitter can send heart rate information to nikeplus.com web service.