The Fingertip pulse oximeter Model C2F is designed for spot-checking blood oxygen saturation levels and pulse rate. <br> <br> Using it,athletes,pilots and people who would like to know their SpO2 and pulse rate can get accurate readings quickly.That data is the important indicator for whether your body is in the health state. <br> <br> How to use it? Operation of this oximeter is easy .You just need to plug one of your fingers into the comfortable clamp and press the button on the front pannel (Details please read the attached users manual). <br> <br> Measurement completes soon,SpO2,pulse rate,pulse bar will show on the dual color OLED screen. It can displays readings in 4 directions,more convenient,you don't have to bend your finger to read the values,which also ensures the accuracy of measurement. Each time you press the power button,the oximeter switches to another display mode,it can display measurement results in 4 directions. <br> <br> The brightness of the display is 10 levels,you could adjust it freely. <br> <br> Its small size makes it easy to carry around in its durable carrying case. <br> <br> This is not a medical device,perfect for sports and aviation. <br> <br> What's in the box? One Fingertip Pulse Oximeter C2F with lanyard,users manual,durable carrying pouch, two AAA alkaline batteries could be continuously operated 40+ hours.