The RADēCO Model H-811 AC/DC is a dependable, lightweight high volume air sampler which can operate off 12 or 24VDC as well as 120 VAC. This microprocessor based high volume air sampler will operate virtually anywhere. The unit has a slip connector for powering off a car battery or a RADeCO RAD1224 Battery Pack as well as a removable AC power cord for when line power is available. This one unit can replace up to 6 air samplers. Three AC units with different calibrations and three DC units with three different calibrations.