A portable, battery-operated pulse oximeter for monitoring blood-oxygen and heart rate. A simple non-invasive digital device that indirectly measures the oxygen saturation of a patient's blood . Digitally displays the percentage of SPO2 along with the patient's pulse rate in 6 changeable display modes. Perfect for EMS, visiting nurse, or wherever portability is required. Features include: SPO2 and pulse rate, 6 changeable display modes, 10 display brightness settings, visual and audible alarms , 25% smaller than competing models, bright LED display, hinged battery cover is more secure, complete with carry lanyard and black rubberized bumper. . 2 "AAA" batteries. Instruction booklet. Two-year limited warranty.