Features:The new HBO-Smart device is the latest fingertip pulse oximeter from Drive DeVilbiss International intended for use in homes or hospitals for non-invasive measurement of oxygen saturation, pulse rate, and perfusion index.Including adjustable settings for user alerts and four optional screen displays, this new stylish device has everything you would expect from a modern-day spot-checking oximeter that can be used for both children and adults.OLED display includes heart rate bar and plethysmography waveformFour different directional screen settingsFeatures battery low alert and automatic power off after 8 seconds without detecting a signalLow power consumption (2 AAA batteries for 25 hours of operation)