Features: Full alarm system with adjustable limits. Optical and audible alarms. Perfusion index bar and signal bar. 24hours memory. Apnea diagnosis through Digital View.RS-232 data link for printer and PC. Technical Specifications Power supplyMeasurment range %SpO2 :0 to 100%Pulse Rate :25 to 250bAccuracy %SpO2Adult :+-% at 70 to 100%SpO2Neonate :+-3% at 70 to 100%SpO2Not specification for lower Accuracy Pluse+-2bpmAlarm systemThe alarm will sound at the conditionsof SpO2 limits and pulse rate limits, system failure and low battery 1.5V Alkaline two "AA" size batteries or tow NIMHrechargeables or AC poweradapter.Display Indicators LCD Segment display with LCD backlighting. Displayof SpO2 , Pulse rate, SpO2 limits, Pulse rate limits, battery status, signal bar, signal amplitude Output InterfaceSerial RS-232