The Pulse Oximeter, based on all digital technology, is intended for noninvasive spot-check measurement of functional oxygen saturation of arterial hemoglobin (SpO2). Advanced DSP (Digital Signal Processing) algorithm can minish the influence of motion artifact and improve measurement accuracy of low perfusion. Perfusion Index is an indication of the pulse strength at the sensor site. Respiratory rate or breathing rate, is the number of breaths a person takes in one minute while at rest. The act of breathing is controlled by the brain, which tells the body to breath based on oxygen and carbon dioxide levels in the blood, and certain factors, such as exercise, drugs, and alcohol, can affect a person’s breathing rate. An abnormally high or low respiratory rate may indicate certain medical conditions such as bradypnea, apnea or tachypnea.