The Ultrafire 1" LCD USB Rechargeable Digital Pulse Oximeter takes fast、 non-invasive measurements of blood-oxygen saturation level and pulse rate at the fingertip. It measures SPO2 (percentage of oxygen saturation in the blood) with a range of 35% to 100%、 plus pulse rate with a range of 25 to 250BPM. Simply place it on your finger and wait for accurate readings. Large、 easy-to-read LCD screen displays test results in oversized numbers. With built-in rechargeable lithium battery、 it supports USB charging for added convenience. Adjustable velcro strap secures the device to your index finger. Click and order now!                                    <p>Features</p>            <ul><li> Takes fast、 non-invasive measurements of blood-oxygen saturation level and pulse rate at the fingertip</li><li> Measure SPO2 with a range of 35% to 100%、 plus pulse rate with a range of 25 to 250BPM</li><li> Easy to use、 simply place it on your finger and wait for accurate readings</li><li> Large、 easy-to-read LCD screen displays test results in oversized numbers</li><li> Built-in rechargeable lithium battery、 support USB charging</li><li> Adjustable velcro strap secures the device to your index finger</li><li> Curved back for comfortable use</li><li> Low battery indicator</li><li> Auto power off when no operation</li><li> Compact and light、 ideal for traveling </li></ul>                                                            <p>Specifications</p>            <table width="100%" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td width="131"> Material</td><td width="365"> PVC</td></tr><tr><td width="131"> Screen</td><td width="365"> 1" LCD</td></tr><tr><td width="131"> Control Mode</td><td width="365"> Manual</td></tr><tr><td width="131"> Target Position</td><td width="365"> Finger</td></tr><tr><td width="131"> Power Supply</td><td width="365"> Built-in Rechargeable 3.7V 150mAh Lithium Battery</td></tr><tr><td width="131"> Power Adapter</td><td width="365"> USB</td></tr><tr><td width="131"> Oxygen Saturation Range</td><td width="365"> 35-100%</td></tr><tr><td width="131"> Oxygen Saturation Accuracy</td><td width="365"> ÷ 2% (80-100%)、 ÷ 3% (70~79%)</td></tr><tr><td width="131"> Pulse Rate Range</td><td width="365"> 25-250bpm</td></tr><tr><td width="131"> Pulse Rate Accuracy</td><td width="365"> ÷ 2bpm</td></tr><tr><td width="131"> Operating Voltage</td><td width="365"> DC 3.4-4.3V</td></tr><tr><td width="131"> Operating Temperature</td><td width="365"> +5 - +40→</td></tr><tr><td width="131"> Transportation and Storage Temperature</td><td width="365"> -10 - +50→</td></tr><tr><td width="131"> Operating Humidity</td><td width="365"> 15%-80% (Non-Condensing)</td></tr><tr><td width="131"> Transport and Storage Humidity</td><td width="365"> 10%-90% (Non-Condensing)</td></tr><tr><td width="131"> Operating Atmospheric Pressure</td><td width="365"> 860hPa-1060hPa</td></tr><tr><td width="131"> Transportation and Storage Atmospheric Pressure</td><td width="365"> 700hPa-1060hPa</td></tr><tr><td width="131"> Color</td><td width="365"> Black</td></tr><tr><td width="131"> Dimensions</td><td width="365"> (1.38 x 1.30 x 0.71)" / (3.5 x 3.3 x 1.8)cm (L x W x H)</td></tr><tr><td width="131"> Weight</td><td width="365"> 0.56oz / 16g </td></tr></tbody> </table>                                                            <p>Package Includes</p>            <ul><li>1 x Digital Pulse Oximeter</li><li>1 x USB Cable (22÷2cm)</li></ul>