Average Customer Rating

  4 out of 5
  • Slim heart rate monitor watch with a sleek design is ideal for monitoring your heart rate while exercising
  • Zone Pointer mode displays where you heart rate fits within target zone
  • OwnCal function shows your energy expenditure during 1 or many sessions
  • Time in Target Zone calculates amount of total exercise time spent in zone
  • 24-hour clock with day/week indicator and stopwatch; 2-year warranty
$68.88
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. ....read more