Stay healthy using a Fingertip Oxygen and Heart Rate Monitor The pulse oximeter measures the oxygen saturation in your blood Also displays your heart rate to monitor your heart health Clear 1.1" display, colour OLED, 96x64 resolution Powers off automatically Material: PVC Requires 2 x AAA batteries (not included) Dimensions: 37mm x 33mm x 58mm See Full Details for more technical specifications 11.99 pounds instead of 39.99 pounds for the Heart Rate Monitor - save 70%