The Polar S120 Heart Rate Monitor enables you to work out more efficiently and effectively and reach your fitness goals. It comes with the S120 wrist receiver, a transmitter that's worn comfortably around your chest, and an elastic strap to hold the transmitter in place. The wristwatch-like receiver features a large display that includes 12/24-hour time of day, alarm, and stopwatch. It provides readings of maximum heart rate of total exercise, average heart rate of each lap, and recovery measurement (by either heart rate divided or time).