Garmin HRM 200 Heart Rate Monitor, Accurate Heart Rate and HRV Data, Comfortable Machine Washable Strap, M-XL

M – XL Strap 28"-42" The HRM 200 heart rate monitor transmits accurate real-time heart rate and heart rate variability data to compatible Garmin smartwatches and cycling computers, fitness equipment, and apps Up to 1 year of battery life with a user-replaceable battery