Cardinal Health Essentials Portable Fingertip Pulse Oximeter features a light and compact design, digital OLED screed with 10 brightness levels and 6 display modes.  Easy to operate. Measures oxygen saturation levels and pulse rate with a simple fingertip design.  Auto shut off after 8 seconds if not used.  Includes pulse oximeter, lanyard, carrying bag, two "AAA" batteries and instruction manual.  Not for continuous monitoring. Fingernail polish or false fingernails may cause inaccurate readings.