Medel Fingertip Pulse Oximeter CMS50D is the pulse oximeter capable of calculating oxygen saturation (SpO2) and heart rate (pulse). Measurement method: Non-invasive measurement of arterial oxygen saturation and heart rate on the finger. Battery power supply: 2 alkaline AAA 1,5V, which can be operated continously for 20 hours. Pulse Oximeter features in small volume, low power consumption, convenient operation and being portable. It is only necessary for patient to put one of the fingers into a fingertip photoelectric sensor for diagnosis, and a display screen will directly show measured value of Hemoglobin saturation. At the same time, the device can measure the pulse rate simultaneously. Accessories: Oximeter, 1 hanging rope, 2 batteries (optional), user manual.