The stylish Polar FS1 heart rate monitor helps you to easily and accurately measure your heart rate to help you get to just the right intensity or your exertion level. This basic HRM features added stopwatch and time-of-day watch features, extra-large digits for easy readability, and one-button functionality. It provides a visual and audible alarm when you reach your target heart rate zone. It provides information on total exercise time and average heart rate during total exercise time. It's water resistant to 50 meters.