Mio VELO Cycling Heart Rate Band Comfortable and accurate alternative to a heart rate monitor chest strap. Transmit data from ANT+ speed and cadence sensors straight to iOS smartphone apps. Transmits heart rate to smartphone, GPS watch & bike computer. Sync wirelessly via Bluetooth Smart (4.0) to popular fitness apps. 5 heart rate zones with colored LED lights. Water resistant up to 30m (3 ATM / 100 ft.) Compatible with Mio PAI app (Personal Activity Intelligence). For Mio product support, please contact 1-877-770-1116 (Mon-Fri: 9am to 5pm PST).