Fingertip pulse oxymeter to monitor pulse oxygen saturation, pulse rate, and perfusion index.Light, small in size and easy to takeDual-color display of SpO2, PR, PI, Plethysmogram and pulse barAutomatic power On/OffMore than 30 hours continuous working with 2 AAA alkaline batteriesAudible and visible alarm functionBattery voltage indication, low battery voltage alarmSize: 66 x 36 x 33 mm