Heart Rate Data in all Three Disciplines Specifically designed for triathletes Our smallest and lightest heart rate monitor (HRM) Comfortable, easily adjustable strap Stores and forwards heart rate data to your compatible device1 Enhance your triathlon experience by pairing HRM-Tri with your compatible device1. The HRM-Tri stores heart rate data when underwater, then forwards it to the device. Our smallest and lightest module fits within the width of the strap. Its soft, rounded edges and covered seams make the strap super-comfortable out of the water, too. Running Dynamics HRM-Tri also has an accelerometer in the module that measures torso movement to calculate 3 running metrics:2 Cadence — the number of steps per minute. It displays the total steps (right and left combined). Vertical oscillation — the bounce in your running motion. It displays the vertical motion of your torso (measured in centimeters). HRM-Tri is compatible with several other fitness products but will only display heart rate when paired. Ground contact time — the amount of time in each step that your foot spends on the ground while running (measured in milliseconds). Example of Typical Uses HRM-Tri HRM-Swim Bike rides, runs, bricks Pool swims Open water swims Open water swims Triathlon competition (open water swim) Triathlon competition (pool swim), triathlon kit not required Triathlon competition (with pool swim) while wearing triathlon kit Runs or bike rides as part of a multi-sport activity that includes a pool swim ¹Compatible devices, ²Running dynamics features are available only on the Forerunner 620/920XT and fēnix 2/3. HRM-Tri is compatible with several other fitness products but will only display heart rate when paired.