Polar FT7F Heart Rate Monitor 1 ea Watch Comes with comfortable textile transmitter and coded heart rate transmission to avoid cross-talk. Heart rate is the measurement of the work your heart does. Heart rate can be expressed as the number of beats per minute or as percentage of your maximum heart rate. Heart rate can also be expressed as a percentage of your heart rate reserve, meaning the difference between your resting heart rate and maximum heart rate (HRR = HRmax - HRrest). In Polar software or during strength training, heart rate can be displayed as a graphical trend. See More at http://www.watchesstock.com/polar-ft7f-watch http://bit.ly/pFzR6H