Medel Oxygen PO01 Fingertip Pulse Oximeter is capable of calculating oxygen saturation (SpO2) and heart rate (pulse). Measurement method Non-invasive measurement of arterial oxygen saturation of haemoglobin and pulse rate in finger. Accessories: Oximeter , 1x Lanyard, 1x Belt bag, 2 AAA batteries 1.5 V last for approx. 2 years of operation at 3 measurements per day (each of 60 seconds) and instruction manual. Using the device for long periods may cause pain for people with circulatory disorders. Therefore do not use the pulse oximeter for longer than approx. 2 hours on one finger. The pulse oximeter displays a current measurement but cannot be used for continuous monitoring.