Carex OTC Finger Pulse Oximeter.The Carex OTC Finger Pulse Oximeter allows you to monitor and maintain pulse and oxygen saturation levels for optimal health. Accurate, fast oxygen level and heart rate measuring technology is ideal for sports enthusiasts.Recommended for spot-check monitoring only.No prescription required.Includes manual, lanyard and two AAA alkaline batteries.Monitor and Maintain Pulse Rate and Oxygen Saturation Levels