COROS Heart Rate Monitor W 840v1 Includes multiple pockets to fit

Includes multiple pockets to fit your running essentials

Stingrays are friends

athletic fit offers a complete range of motion without feeling too tight

4D Guidance System provides innovative protection for every type of runner

with a focus on durability and grip for road running

COROS Heart Rate Monitor W 840v1 Includes multiple pockets to fitComfortable and simpler to wear than a chest strap. Easy to adjust the fit and remove the sensor for quick cleaning. Our latest multi channel optical sensor for precise measurement. Up to 3 simultaneous connections with Bluetooth enabled devices. Wear detection allows for automatic device pairing for new workouts. 38 hours of full operation or 80 days in standby mode on a single charge. Rechargeable with a magnetic USB charging cable.