MD300C926 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. 1.12 OLED display SpO2, PR, and Pulse bar; 2. Level 1-7 adjustable brightness; 4-direction display; 3. Special battery cover for more durability; 4. 2 AAA alkaline batteries; 5. Suitable for adult and pediatrics; 6. Up to 72-hour data storage and review; 7. Power off automatically when no operation for about 8s;