Heart Rate Monitor 3 Functions

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 

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.