It  measures quickly and accurately pulse rate and spo2 blood oxygen saturation of arterial hemoglobin levels. Accurately determine your spo2 (blood oxygen saturation levels,  Oxygen monitor finger own the large digital led display can clearly read the results, can read in multiple directionsAccurate: rotatable multidirectional display, allows you to view your results in any direction plus pulse wave, pulse rate, bar graph, spo2 level and battery levelNote: 2 AAA batteries required which includes in package. The oximeter automatically powers off after 10 seconds of inactivity and can be operated continuously for more than 20 hoursIn the box: 1x pulse oximeter, 1x user manual, 1x lanyard, 2x aaa batteries | each device undergoes rigorous testing.