A cough turns in to pneumonia when the lungs are obstructed causing less and less oxygen to make it into the blood. The Digital finger oximeter is your early warning system for pneumonia! Pulse oximetry by this digital finger oximeter is a simple, painless, and fast test that measures the current oxygen levels (aka oxygen saturation) in your blood. Using a larger OLED display, which is more clear than other oximeters, so it is easy to read, including the elderly. Just clip it on to your finger and turn it on at the press of a button. It is durable, lightweight, and compact that is portable so you can take it with you on the go. It is great for sports enthusiasts like mountain climbers, skiers, bikers or anyone interested in measuring their SpO2 and pulse rate.