The F4™ Black Thunder heart rate monitor from Polar® combines all the necessary heart rate features with a new, slim design. It includes the popular Zone Pointer feature that helps keep you in your Target Zone and OwnCal® to track the calories you burn during your exercise. With a stopwatch and convenient button-free operation, the F4™ is a valuable fitness tool. A T31 Coded™ transmitter is included. more info

The F6 is a stylish model with advanced features previously found on products over $150. more info