The COROS heart rate monitor provides over 38 hours of continuous, accurate heart rate monitoring to track your workout distraction-free and in comfort. Soft fabric band is easier to wear than a chest strap. It lies flat around your arm and sits firmly in place thanks to its textured surface. The flat design prevents snagging on clothing or gym equipment, so you can forget you're even wearing it. Adjust the perfect position and tension of the durable elastic band by simply sliding the buckle until it feels comfortable. Thanks to the secure Velcro fastening, you can quickly remove the sensor to easily wash the band. The latest generation optical multi-channel sensor delivers high signal quality. Advanced sensor housed in a robust yet slimline casing and protected by a scratch-resistant cover provides reliable and accurate heart rate data for years to come.