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■  Display Format: LCD ■ SPO2:35-99% ■ Pulse Ratio:30-255 BPM ■ Pulse Wave: LCD Numeric Display ■ Battery Voltage Low Indication: LCD Bar Graph. ■  Power Requirements: Two AAA size 1.5V Alkaline Batteries ■ Power Consumption: less than 15 mA. ■ Resolution: 1% for SPO2 and 1 BPM for Pulse Ratio. ■ Measurement Accuracy: ±2% in stage of 70%-99% for SPO2 ■ Unspecified in stage of 35-69% for SPO2 ■ ±2BPM or ±2%(Select Larger)for Pulse Ratio. ■ Measurement Performance in Low Perfusion: SPO2 and pulse rate can be shown correctly when pulse-perfusion ratio is 0.4% ■Interference  Resistance  Capacity  against  Ambient Light :  Deviation  is  smaller than  ±1% ■ It is equipped with a function switch, through which the Oximeter can be automatically powered off when no finger is in the Oximeter more than 4 seconds