Pulse Oximeter with Perfusion Index, 6 levels of Brightness and Display orientation Modes, auto offPrinciple of the CMS50DA Pulse Oximeter is as follows: Photoelectric Oxyhemoglobin Inspection Technology is adopted in accordance with Capacity Pulse Scanning & Recording Technology,the Pulse Oximeter can be used in measuring the pulse oxygen saturation and pulse rate through finger.The product is suitable for being used in family, hospital, oxygen bar, community healthcare, physical care in sports (It can be used before or after doing sports, and it is not recommended to use the device during the process of having sport) and etc.Major FeaturesSpO2 value displayIntegrated with SpO2 probe and processing display modulePulse rate value display, bar graph displayPulse waveform displayThe display mode can be changedScreen brightness can be changedDisplay format can be saved after power offMain performanceDisplay Mode:0.96" Dual-color OLED display(blue and yellow)Screen Resolution:128*64SpO2 Measuring Range:0%~100%, (the resolution is 1%).Accuracy:70%~100%:2% ,Below 70% unspecified.PR Measuring Range:30bpm~250bpm, (the resolution is 1bpm)Accuracy:2bpm or 2% (select larger)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).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%Power Consumption:less than 30mAVoltage: DC 2.6V - 3.6VPower Supply:1.5V (AAA size) alkaline batteries 2Battery working hour: Two batteries can work continually for 20 hours,The theoretical number is 36 hoursSafety Type:Interior Battery,BF Type