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