Specifications:<br />Display type: OLED(Organic Light-Emitting Diode ) display<br />Dimensions:<br />Size: 65mm × 34mm × 35mm <br />Weight : 54g(including batteries)<br /><br />Oxygen Saturation Display: 70 - 99%, ± 2%;<br />Normal oxygen saturation was 95% to 100%, <90% showed respiratory failure, <80% description severe hypoxia.<br />Lower than normal oxygen saturation may be: hypoxic hypoxia, pneumonia, emphysema, high depletion of oxygen, <br />blood hypoxia, circulatory hypoxia, tissue hypoxia, etc.<br />Pulse Rate Display: 25 - 250 BPM, ± 1% or ± 1bpm(larger)<br />Normal pulse and heartbeat is consistent. Normal adult is 60 to 100 beats / min, usually 70-80 times per minute, <br />with an average of about 72 beats / min. Older slower, from 55 to 60 beats / min<br />Power:<br />low consumption: less than 30mA.<br />power requirements: Two AAA 1.5 V alkaline batteries (Not included)<br />voltage adjust range: 2.6 - 3.6V<br />Measurement Accuracy: SPO2 acccuracy ± 2% on the stage of 70%-99%,no definition of less than 70% pulse rate of ± 1% or ± 1bpm(larger)<br />Ambient light immunity: natural light in the room and the lighting source are in dark conditions and oxygen measurements <br />and compared with the measured value, the deviation is less than 1%<br />Environmental requirements:<br />Temperature of - 10 to 40°C<br />Humidity of 10% - 95%<br />Avoid direct sunlight, avoid contact with hot infrared or ultraviolet light<br /><br />Package include:<br />1X Pulse oximeter with box<br />1X Hanging belt<br />1X Instruction book<br /><img src="http://img6.eachbuyer.com/x9/p100/eb03793_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb03793_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb03793_3.jpg" />