The Tom Tom Runner 2 cardio small heart rate monitor is a multisport GPS watch providing real-time running information & enabling you to run in 5 different heart rate training zones to get results faster. This functional device helps you fine tune your performance & allows for training in bike, swim, gym & treadmill modes. It is designed to give you accurate heart rate information on your wrist & has a race mode that lets you select one of your past performances to race against. Improve speed & overall fitness with custom work-rest sessions & track your performance on the treadmill or in the gym with an indoor training mode.