Features for Pulse Oximeter: - Two color OLED display， four display modes - 4-direction display - Real-time spot-checks - Pulse waveform & bargraph display - Advanced setting for alarm - Functions of audio alarm and pulse sound - Automatic power off - Low power consumption - 50 hours continuous to work - Low perfusion ≤0.4% - Low voltage indicator - Widely used in hospital， home healthcare， oxygen bar， community medical centre， alpine area， sports healthcare etc. - Measure SpO2 and PR accurately Display OLED two color display SpO2 Measurement range: 70～99% Resolution: ±1% Accuracy: ±2% (70%～99%)， unspecified (<70%) 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 Dimension & Weight 58 (L) × 31(W) × 29(H) mm 55g (with batteries)