MD300C15D 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. Accurate Measurement Professional Guarantee 1. Small & lightweight design 2. LCD screen display SpO2, PR, and Pulse bar 3. Low power consumption; battery-low indicator 4. Automatically power off ; 2 AAA alkaline batteries 5. Suitable for pediatrics and adults