The heart rate monitor includes a comfortable splash-proof chest belt that wirelessly sends analog heart rate data to the watch. The visual heart rate alert will beep and the icon display will flash if you are below or above your target training zone. Features stopwatch, calories burned, 12/24 hour clock with alarm function and calendar, and EL backlight. Water resistant up to 164 feet/50 meters. Shock resistant up to 3 feet/1 meter.