... : Less than 40mAResolution: ±1% for SP02 and ±1 BPM for Pulse RatioMeasurement Accuracy: ±2% in stage of 70%-99% SP02 and ... %),unspecified(<70%)for SPO2,±2BPM or ±2%(select larger) for pulse ratio.Power:1 rechargable Li batteryCharge manner:AC transformer or ... %),unspecified(<70%)for SPO2,±2BPM or ±2%(select larger)for pulse ratioPower:1.5V(AAA size)alkaline batteries x2Can work more ...