The Fingertip Pulse Oximeter from Baseline is a portable, compact, non-invasive, TAA compliant measuring tool that determines the amount of oxygen the body is carrying. Attaching painlessly to a fingertip, it sends two wavelengths of light through the finger to measure pulse rate and how much oxygen is in the user's system. While this pulse oximeter is measuring the user's blood oxygen level, it can also simultaneously measure the user's pulse rate. Results are shown on a bright and easy to read LED display. Changing the orientation of the display from vertical to horizontal is made easy with just a push of the power button. Suitable and accurate for both adult and pediatric use. Sturdy enough for hospitals and clinics as well as for in-home patients. Terrific for non-invasive spot checks of the blood oxygen level. However, please note, it is not to be used for continuous monitoring. Comes complete with the Oximeter, a lanyard, two AAA batteries and an illustrated instruction guide. Built solidly, the pulse oximeter will not require routine calibration or maintenance other than the occasional replacement of batteries. Easy to maintain and clean. Prior and after each use, wipe down the silicone area that fingers touch inside the unit with 70% isopropyl alcohol (rubbing alcohol).