Specification: Display:OLED two color display,waveform display SpO2:Measurement range: 70~99% Resolution: ±1% Accuracy: ±2% (70%~99%), unspecified (<70%) Product accessories Pulse rate :Measurement range: 30~240 bpm Resolution: ±1% Accuracy: ±2bpm or ±2% (select larger) Low Perfusion ≤0.4% Power:1.5V (AAA size) Alkaline battery x 2 Supply voltage: 2.6~3.6V Working current:≤30mA Automatic power-off:Automatically power off when no signal in the oximeter for more than 8 seconds