MD300C21C Finger Type Pulse Oximeter Pulse oximeter is a very important and common device to check oxygen saturation (SpO2) and pulse rate. As a small, compact, simple, reliable and durable physiological monitoring device, Fingertip pulse oximeter is widely applied in clinic, hospital, social medical organization, first aid and homecare etc. Dual color OLED displays SpO2, PR, Pulse bar, and waveform Low power consumption; battery-low indicator Adjustable brightness, 6 display modes Automatically power off; 2 AAA alkaline batteries Optional multi-color silicon rubber boot and carrying case