The optimal choice for group exercisers like in-door cyclists. Coded transmission prevents crosstalk with other monitors so you'll get a personalized workout, even in a class environment. The F6™ is an excellent exercise motivator. It includes all the features of the F4™, plus guidance with OwnZone® to automatically establish your personal target heart rate zones and feedback with OwnCal® to track your calories and % of fat burned, making it a perfect exercise companion.