Fingertip Pulse OximeterAdopting the principle of photoelectric detection and built-in high-performance sensors, non-invasive measurement of blood oxygen and pulse rate is realized, and the detection results are quickly displayed within 3-5 seconds. The blood oxygen saturation is between 80% and 99%, with an accuracy of 2%; Blood oxygen saturation is between 70% and 79%, with an accuracy of 3%. 4 Directions DisplayThe display direction of the measurement results can be changed by pressing the start button, supporting positive and negative horizontal and vertical, and it is also convenient to use in bed. HD Backlit Color ScreenThe large digital LED screen clearly displays the SpO2 value, pulse rate, pulse bar graph, perfusion index and battery level in different colors for easy resolution and reading, even in low light conditions. User-Friendly DesignOne-button operation, simply insert your finger into the rubber hole of the oximeter and press the start button. The measurement results will be displayed in about 3-5 seconds. It is simple, fast and easy to use. It automatically turns off after 8 seconds when not in use to save 2 x AAA battery power (not included). Applicable to a Wide Range of PeoplePackages: 1x Fingertip Oximeter, 1x Lanyard, 1x User Manual. Portable design that can be taken anywhere, suitable for climbers, skiers, motorcyclists, pilots or those who are interested in measuring blood oxygen saturation and heart rate on the road. It is your indispensable health companion.