Loaded with features at a great price, the Timex 5G971 offers great bang for the buck! EKG accurate heart rate during exercise Large, easy-to-read display Target zone alarm Recovery heart rate timer Calorie counter tracks calories burned during exercise Displays heart rate in beats per minute or percent of maximum Automatic activity timer keeps track of exercise time Recalls time in target zone, activity time, and average and peak heart rate Comfortable, lightweight transmitter with owner-replaceable battery Elastic strap fits chest sizes from 25 inches to 53 inches Water-resistant 30m (sensor will not provide accurate heart rates when under water) INDIGLO® night-light backlight Watch with 12/24 hour time and month/date display 2 year average battery life One year warranty