Display format: LED SPO2: 3599% in 2-digit 7-segment digital. Pulse rate: 30240 BPM in 3-digit 7-digital. Pulse Wave: 6-segment bargraph. Bettery Voltage Low Indication: LED signals. Power Requirements: 2AAA size 1.5V Alkline Battery. Power Consumption: Less than 40mA. Resolution: +-1% for SPO2 and +-1 BPM for Pulse rate. Measurement Accuracy: +-2% in stage of 70%-99% SPO2 and meaningless when stage being smaller than 70%, +-2% BPM for Pulse rate. Measurement Performance in Weak Filling Condition: Oxyhemoglobin and pulse rate can be shown correctly when pulse-filling ratio is 0.5%. Interference Resistance Capacity against Ambient Light: Deviation is smaller than +-1% between value of Oxyhemoglobin measured in natural lighting indoor condition and present lighting sources and that measured in dark room. 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 8 seconds.