Garmin Watch HRM-Swim 010-12342-00. Take your training to the next level by pairing HRM-Swim with your Forerunner 920XT. Specifically designed for use in the pool, the sleek, non slip strap stays in place, even during wall push offs. Once you're out of the water, including when the torso is lifted out of the water mid session, real time heart rate, interval summaries and stored heart rate are transmitted to the 920XT.