Whether you’re protecting general workers or responders in industries includingpetrochemical, steel, or utilities, the Honeywell BW™ Flex Series delivers what youneed in an easy to use serviceable package. Sensor 1: %LEL (combustibles), catalytic, unfiltered Sensor 2: O2 (Oxygen) Sensor 3: CO2 (carbon dioxide) digital Sensor 4: SO2 (sulfur dioxide) inflow Housing: Yellow housing Region: MED/ATEX with Performance (LEL/O2)