Pulse Oximeter is a non-invasive device intended for the spot-check of oxygen saturation of arterial hemoglobin (SpO2) and the pulse rate of adult and pediatric patients in home and hospital environments (including clinical use in internist/surgery, anesthesia, intensive care ect.). This device is not intended for continuous monitoring. Major Features 1)value display 2)Pulse rate value display, bar graph display 3)Pulse waveform display 4)PI value display 5)The display mode can be changed 6)Low-voltage indication: low-voltage indicator appears before working abnormally which is due to low-voltage 7)Pulse sound indication and over limit indication