Provides indication regarding how well the heart is pumping oxygen throughout the body. Can also be used at home to monitor for anyone with a condition like asthma, anemia, Chronic Obstructive Pulmonary Disease (COPD), pneumonia, lung cancer,heart failure, congenital heart defects that may cause them to experience periods of low oxygen levels. Also used for people with these conditions to monitor oxygen levels while exercising, traveling at high altitudes, taking a new medication, or starting out on prescribed supplemental oxygen.