* Display Format: LED 　　　SPO2:35-99% in two-digit 7-segment digital; 　　　Pulse Ratio:30-240BPM in 3-digit 7-segment digital; 　　　Pulse Wave: 6-segment barograph; 　　　Battery Voltage Low Indication: LED signals. 　　* Power Requirements: Two AAA size 1.5V Alkali Battery; 　　* Power Consumption: less than 40mA. 　　* Resolution: ±1% for SPO2 and ±1 BPM for Pulse Ratio. 　　* Measurement Accuracy: ±2% in stage of 70%-99% SPO2 and meaningless when 　　　stage being smaller than 70%. ±2 BPM for Pulse Ratio. 　　* Measurement Performance in Weak Filling Condition: Oxy haemoglobin and pulse 　　　value 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 Oxy haemoglobin measured in natural lighting indoor 　　　condition and present lighting sources and that measured in dark room. 　　* It is equipped with a function switch, hrough which the Oximeter can be 　　　automatically powered off when no finger is in the Oximeter more than 8 　　　seconds.