The NIMBUS Active Technology Large-Room Air Purifier Purifies the air in 650 SF to 850 SF rooms using more effective, more efficient active filterless technology Ultra-quiet user-friendly programmable operation (3 convenient settings)--Weighs just 2.38 lbs. and sits comfortably on a desktop or night table Uses state-of-the-art active technology to attack bacteria, viruses, and mold spores in the air and eliminate them Super energy-efficient--consumes just 19 watts of power 1-Year Manufacturer?s Warranty