[Multi-fonction]Digital pulse oximeter can be used to measure pulse rate, blood oxygen saturation levels and perfusion index accurately.[Easy to Read]Automatic 4 display directions, you can view your result in any direction.[Easy to Use]Accurate and reliable, one-button operation, just clip it on to your finger and turn it on at the press of a button. Automatic power off after 8s when not in use.[Widely Applicable]Suitable for everyday use. Widely used in family, hospital, oxygen bar, social medical organizations, physical care in sports, etc.[Compact Size]The oximeter is lightweight and portable, and it comes with a lanyard for easy carrying.