Display Format: OLED DisplaySpO2 Measuring Range: 0% - 100%Pulse Rate Measuring Range: 30 bpm - 250 bpmPulse Wave Display: columiation display and the waveform displayPower Requirements: 2 ×1.5V AAA alkaline battery(or using the rechargeable battery instead), adaptable range: 2.6V~3.6VPower Consumption: Smaller than 30mAResolution: 1% for SpO2 and 1 bpm for Pulse RateMeasurement Accuracy: ±2% in a stage of 70%-100% SpO2, and meaningless when stage being smaller than 70%. ±2 bpm or±2% (select larger) for Pulse RateMeasurement Performance in Weak Filling Condition: SpO2 and pulse rate can be shown correctly when the 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 human-made light or indoor natural light and that of darkroom is less than ±1%It is equipped with a function switch. The Oximeter can be powered off in case no finger is the Oximeter within 5 secondsOptical SensorRed light (wavelength is 660nm, 6.65mW)Infrared (wavelength is 880nm, 6.75mW)