This oximeter can measure and monitor heart rate, SpO2 and pulse intensity with high accuracy. Displays waveform (plethysmograph) and digital readings, as well as pulse bar graphs, to visually indicate any irregularities or abnormalities, such as weak heartbeat. FDA 510(K) Cleared. Insert finger into rubber of the pulse oximeter and press “on”. Intelligent tool for exercise recovery, elderly, hikers, climbers (monitor the oxygenation rate of cells, for overall health). Essential to take reading without moving the body or hand to obtain accurate result. Monitor is very light, small in size, low in power consumption and easy to carry with detachable lanyard; so, you can measure oxygen saturation anywhere. Auto power off s seconds after removing finger saves battery life. Requires two AAA batteries.