The pulse oximeter uses an advanced chipset and infrared detector to ensure you get accurate and reliable readings. Fingertip pulse oximeter can accurately measure your SpO2 and pulse rate, and conveniently display it on the large digital LED display. Just insert your finger and press the button, and the reading will be displayed on the display within 8 seconds. One-button control makes measurement more convenient and easier, even children and the elderly can operate independently. Our SpO2 sensor supports spot checks and displays your pulse rate, oxygen saturation, and pulse bar graph showing signal strength in real time. The pulse monitor will automatically turn off when it does not detect your finger within 5 seconds to ensure low power consumption. 2*AAA battery (not included) supports 600 measurements and more than 30 hours of continuous working time. The pulse oximeter is suitable for home use and outdoor use, and fits all finger sizes-from children to adults. You should only use the pulse oximeter before and after exercise. When the pulse oximeter measures your pulse rate and SpO2 level, you must remain still.