... : 22.5×20×8.5cm8Boxes /CTNS : 480×420×200mm Finger Pulse Oximeter Function:1,Monitoring pulse, SpO2,PR(Pulse Rate). 2,Displaying ... ,Equipped accompany with sound of heartbeat. Feature:1,Display Method: Color OLED display,4 display directions.2,The product is small in size, ... battery voltage is so low that normal operation of the oximeter might be influenced5,The product will automatically be powered ...