Major Features1)SpO2 value display2)Pulse rate value display, bar graph display3)Pulse waveform display4)The display mode can be changed5)Screen brightness can be changed6)Display format can be saved after power offMain performance1) Display Mode:Color  display2) Screen Resolution:128*643) SpO2 Measuring Range:0%~100%, (the resolution is 1%).   Accuracy:70%~100%:±2% ,Below 70% unspecified.4) PR Measuring Range:30bpm~250bpm, (the resolution is 1bpm)   Accuracy:±2bpm or ±2% (select larger)5) Measurement Performance in Weak Filling Condition:SpO2 and pulse rate can be shown correctly when pulse-filling ratio is 0.4%. SpO2 error is ±4%, pulse rate error is ±2 bpm or ±2% (select larger).6) Resistance to surrounding light: The deviation between the value measured in the condition of man-made light or indoor natural light and that of darkroom is less than ±1%7) Power Consumption:less than 30mA8) Voltage: DC 2.6V - 3.6V9) Power Supply:1.5V (AAA size) alkaline batteries × 2   10) Battery working hour: Two batteries can work continually for 20 hours,The theoretical number is 36 hours11) Safety Type:Interior Battery,BF Type