The Sigma Rox 10 communicates via the ANT+ wireless standard. To make the most of your Rox with all its features on a second bike or to purchase replacement parts, Sigma offers speed sensors, cadence sensors, and the heart rate chest strap as separate components. The Sigma ANT+ heart rate chest strap, featuring a comfortable textile band, accurately monitors your exertion based on heart rate under your jersey. Through the ANT+ radio signal, the data is transmitted directly to the Rox 10, allowing you to precisely control and adjust your training load at any time.