NOW there is a DEPENDABLE and EASY WAY to Spot Check your Oxygen Level & Heart Rate Measurements for your Daily Needs. ChoiceMMed OxyWatch C2A pulse oximeter is a non-invasive device that measures the blood oxygen saturation (SpO2) and pulse rate (heart rate). It displays both blood oxygen saturation (SpO2) & pulse rate (heart rate). ChoiceMMed OxyWatch C2A pulse oximeter provides an easy way of assessing your blood oxygen level and pulse rate. http://www.choicemmedamerica.com/demopic/c2a.html