The Polar WearLink H2 XS-S chest strap heart rate sensor allows you to display your heart rate on compatible Polar devices. The soft strap comfortably fits the contours of your body and leaves you full mobility while training. Thanks to the simple fastening system, the chest strap is easy on and easy off. Provides accurate heart rate data to all Polar training computers using the 5kHz and 2.4GHz WIND transmission technology for maximum compatibility. Take it with you to the gym where the encrypted 5kHz transmission allows the display of your heart rate in real time on compatible fitness equipment, just look for the Polar logo. Even while swimming it transmits heart rate data with products that use a 5kHz transmission frequency.