Pulse oximeter measurement is rapidly becoming accepted as a "fifth vital sign" in addition to temperature, blood pressure, pulse and respiratory rate in clinical assessment. This SmartHeart pulse oximeter quickly, accurately and conveniently measures the oxygen saturation of arterial hemoglobin and your pulse rate any time, anywhere! Just clip it on your fingertip and the red LED display shows your results at the press of a button. Also features low battery indicator and auto shutoff. This device is not intended to replace a doctor's visit & should not be used for medical diagnostic treatment without the guidance of a physician. 2 'AAA' batteries included. Latex free. 1-year limited warranty.