DESC: Great basic features with backlight at a fantastic price! EKG accurate heart rate during exercise Large, easy-to-read display Automatic activity timer keeps track of exercise time Recalls activity time and average, peak, and minimum 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