Coros Heart Rate Monitor (Arm) Colour:Grey built for road racing from

built for road racing from 10K to marathon distance with a lightweight

puncture-resistant sole for natural ground feel on off-road terrain

offering breathable coverage for cooler training runs

Encased elastic waistband w/ drawcord

Coros Heart Rate Monitor (Arm) Colour:Grey built for road racing fromComfortable 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.