Poduct Featues Display Mode:LED display SpO2 Measuing Range:0%~100%, (the esolution is 1%). Accuacy:70%~100%:±2% ,Below 70% unspecified. PR Measuing Range:30bpm~250bpm, (the esolution is 1bpm) Accuacy:±2bpm o ±2% (select lage) Resistance to suounding light: The deviation between the value measued in the condition of man-made light o indoo natual light and that of dakoom is less than ±1%. Powe Consumption:less than 25mA Voltage:DC 2.6V~3.6V Powe Supply:1.5V (AAA size) alkaline batteies * 2 Safety Type:Inteio Battey,BF Type Packing infomation *a hanging ope *a use manual Physical Identity Weight:about 75g Machine Dimension:58(L) * 30W) * 30(H) mm Box volume:10*9*4cm Oute box volume:47.5*37*21cm