Display format: 64k color OLED Display mode: Two direction Back light: OLED SPO2:35-99% Pulse rate: 30-255 BPM Pulse wave: OLED graphic display Battery voltage low Iindication: OLED bar graph Power requirements: Two AA size 1.5V Alkali battery Power consumption: less than 60 mA Resolution: 1% for SPO2 and 1 BPM for pulse ratio Measurement accuracy: ?% in stage of 70%-99% for SPO2 Unspecificed in stage of 35-69% for SPO2 ?BPM or ?% (Select Larger) for pulse ratio Measurement performance in low perfusion: SPO2 and pulse rate value can be shown correctly when pulse-filling ratio is 0.4% Interference resistance capacity against ambient light: Deviation is smaller than ?% 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