More rapid humidification. Humidor enclosures up to 8-10 cubic feet. Cigar Oasis XL Plus uses the same microprocessor technology and features as the Cigar Oasis XL. The basic difference is a change in the air flow and water cartridge which allows the Cigar Oasis XL Plus to pick up more moisture and thus provide more rapid humidification, especially for larger personal humidors, chests, end tables and other similar enclosures. The new Cigar Oasis XL Plus now uses a foam in the water cartridge which the user must fill with distilled water as described in the manual, eliminating wicks and water splashing around. Cigar Oasis XL Plus comes standard with a large cartridge and should be used with AC power since it will run more frequently in larger humidors and battery life would be short. However, when needed, an optional battery pack/water cartridge unit can be attached to the control unit for battery powered operation.