The EZ-LIFE pulse oximeter is a small, portable machine that measures your pulse and blood oxygen saturation through your fingertip without any invasive action. With the power of infrared light technology, the EZ-LIFE pulse oximeter takes a reading from your fingertip to measure the blood beneath your skin and give an accurate, real-time figure. This small device is perfect for clinical, athletic and home situations to regularly monitor a person's oxygen level quickly.