Advanced style pulse oximeter. 1) Can measure SpO2 and Pulse Rate accurately 2) SpO2 and Pulse Rate display,Pulse Rate waveform and bar graph display 3) Battery voltage low indication 4) The display mode can be changed. 5)Screen brightness adjustable SpO2 measurement range: 0%~100% Accuracy: 70%~100%: ±2% 0%~69%: unspecified PR measurement range: 30bpm~250bpm Accuracy: ±2bpm or ±2%, whichever is greater. Resolution: SpO2: 1% PR: 1bpm 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%, whichever is greater. 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%. Working current: ≤30mA Oxymeter look details and color may vary