Innovo Deluxe Fingertip Pulse Oximeter with Plethysmograph and Perfusion IndexACCURATE AND RELIABLE Consistently beat other pulse oximeter in terms of accuracy and reliability during clinical tests. PLETHYMOSGRAPH AND PERFUSION INDEX Tells you if you are taking your SpO2 and Pulse Rate properly. No more second guessing if the readings are reliable or why the pulse oximeter is not giving you a reading. NEW SOFTWARE FEATURES 1) Auditory alarm to warn you when your SpO2 and Pulse Rate are beyond set limits. 2) Auditory Beeps for