Mio VELO Cycling Heart Rate Monitor Wristband

Reads EKG accurate heart rate data, with no chest strap required; Transmits data from existing ANT+ speed and cadence sensors directly to smartphone apps, bike computers, and GPS watches; 5 configurable heart rate zones allow you to customize your workout; Fits wrist sizes 5.9″ – 8.2″ / 148-208mm; Water resistant up to 30m