HRM 600, the premium heart rate monitor, is built for data-driven performance athletes. It provides accurate heart rate and HRV data to compatible Garmin smartwatches and cycling computers, equipment, and apps. Dial in your training with running dynamics, including step speed loss, to understand how much you slow down when your foot hits the ground (with a compatible smartwatch). HRM 600 is easily adjustable and available in two sizes, so it's comfortable to wear during any sport. And when you can't wear a watch, you can record your activity on the heart rate monitor and sync data, including heart rate, calories, speed, distance and more, directly to the Garmin Connect smartphone app. After pushing hard, easily remove the module and throw the strap in the wash. HRM 600 has up to 2 months of battery life with a rechargeable battery.