Specifically designed for swimmers. Non-slip strap. Stores and forwards heart rate data to compatible devices¹. Take your training to the next level by pairing HRM-Swim with your compatible Garmin device. 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 Garmin device. Compatible Devices: fenix 3 series, fenix 5 series, fenix 6 series, Descent Mk1, Forerunner 735XT, Forerunner 920XT, Forerunner 935, Forerunner 945, quatix 5 series, tactix Bravo, tactix Charlie, virb 360.