Knowing your heart rate is important because if you are working out too hard your activity can become counter productive and strain muscles. To achieve an effective workout no matter what the aerobic activity you must maintain your heart rate at a proper level for a minimum of 20 minutes. The proper level is generally 65% 85% of your maximum heart rate.Omron's Weight Management products help you monitor progress in achieving a healthier more active lifestyle. Whether your goal is to maintain or improve overall health lose weight or get more energy in your daily life physical activity is essential to staying healthy. Easy to program monitor with ventilated watch band Backlight function Alarm option for low and high heart rates Mounting bracket to mount watch receiver to most treadmills and bicycles Soft zippered storage case Water resistant watch and chest transmitter belt to 98 feet 30 meters Time of day display and daily reminder alarm feature 1 year warranty