We feel no medicine cabinet should be without our fingertip pulse oximeter to check your blood oxygen saturation (SpO2) and your pulse rate. Small, simple to use and reliable, to give you an early warning if your oxygen levels or pulse rate fall to a dangerous level. Just pop onto your finger and the results are shown on the screen within a few seconds. As used by health professionals and paramedics around the world to monitor Chronic Obstructive Pulmonary Diseases (COPD) including Emphysema, Asthma and Bronchitis. Features and Benefits Easy to use - Small, simple to use and reliable A medicine cabinet essential - Gives reading of blood oxygen levels and pulse rate Specification Dimensions: H3.5 X W3.5 X D6cm Guarantee: 1 Year Battery: 2X AAA