OxyWatch Finger Pulse OximeterPulse Oximeters are a convenient, non invasive measuring instrument which measures the percentage of oxygen saturation in a person's blood (SpO2) and their pulse. Simply place your finger on the sensor, and the Pulse Oximeter automatically analyzes the blood. Oxygen and Pulse readings are shown within a matter of seconds. for home, hospital, clinic, and first aid use adult and child models low power consumption and automatic turn off when not in use 2