This portable Fingertip Pulse Oximeter and Heart Rate Monitor is a battery operated medical electronics device that measures your SPo2 and heart rate PM and displays it right on the built-in LED display screen for your convenience. The Fingertip Pulse Oximeter and Heart Rate Monitor measures the saturated level of oxygen in your blood using photoplethysmography, and measures your heart beat per minute by optically obtained plethysmograph which illuminates the skin and measures changes in light absorption. This Pulse Oximeter and Heart Rate Monitor is suitable for physicians, home doctors (mom), medical students, healthcare workers, athletes, pilots, community sports centers etc. Demand for a lightweight, inexpensive monitor for measuring SPO2 oxygen saturation and heart rate during physically active sports and high-altitude activities is in huge demand, so we present this Pulse Oximeter and Heart Rate Monitor at a wholesale price and directly available to both home users and medical clinics alike. PACKAGE CONTAINS: 1 x Pulse Oximeter 1 x User Manual 1 x Lanyard 1 X Soft Case Requires 2 x AAA batteries (not included)