FEATURES of the Mio LINK Heart Rate Band Mio Continuous Technology with EKG-accurate heart rate data at performance speeds No uncomfortable chest strap, so you can train with heart in comfort Customize your workout with up to 5 user-settable heart rate zones Water resistant up to 30m Transmits heart rate to smartphone fitness apps, GPS watches & bike computers via Bluetooth Smart & ANT Soft, durable silicone strap ensures a snug and comfortable fit