Dwd-2701: fingertip pulse oximeter Technical specification 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