CO-02 Approval:JMLapproved Features: l Audible/visual/vibration lowbatteryalarml Continuousoperationupto3000hrsbyalkalinebattery(std),Ni-Cdversion(Option)l Back-lightforLCDdisplay SpecificationsGasdetectedCOinairDetectionprincipleElectrochemicalcellDetectionrange increments1-1000ppm 1ppm/digit for500ppm 5ppm/digit for500ppm-1000ppmPresetalarms(Adjustable)1st25ppm;2nd50ppm;TWA25ppm;STEL200ppm;OVER500ppmSamplingmethodDiffusionsamplingOperatingtemp humidity-20℃~+50℃,below90%RH,non-condensingPowersourceAlkalinebatteryAAAsize2pcsSafetydesignIntrinsicallysafeEExiaⅡBT4Dimensions weightApprox.85(W) 53(H) 31(D)mm,Approx.130g