Yobekan oximeter is measures quickly and accurately pulse rate and spo2 blood oxygen saturation of arterial hemoglobin levels. Accurately determine your spo2 (blood oxygen saturation levels), fast spo2 readings, pulse measurement.Rotatable multi-directional display, allows you to view your results in any direction plus pulse wave, pulse rate, bar graph, spo2 level and battery level.UNIQUE FEATURE: Auto Power On & Off, Water-Resistant, Buzzer- Visual Alarm. Light and compact, accommodates wide range of finger sizes, long battery life.The oximeter automatically powers off after 10 seconds of inactivity and can be operated continuously for more than 20 hours. Suitable for mountain climbers, skiers, bikers, aviators or anyone interested in measuring their SpO2 and pulse rate while on the move.Its long life battery features give you better performance.Used AAA 2 battries in Pulse Oximeter