The brand new Suunto Cadence POD communicates bike pedaling pace to your Suunto t3c, t4c, or t6c-series heart rate monitor, tracking the most efficient use of your energy while biking. The Cadence POD attaches to your bike's frame. If you want to improve your cycling performance, consider the Suunto t6c Cycling Pack, which couples the Cadence Pod,Road Bike Pod with a Suunto t6c wrist top training computer in a single package.