SHARP Plasma Cluster 7000 Air Purifier Sharp FU-Z51CX With Instruction Manual This item has been used, cleaned, and disinfected, and then stored at home. Operation has been confirmed. As this is a used item, there are stains and scratches. Please check the images. Made in 2011 Simple settings make operation and cleaning easy. "Plasma Cluster technology" emits positive and negative plasma cluster ions, the same as those found in nature. When these ions attach to airborne allergens from dust mites, viruses, and mold, they transform into highly oxidizing OH radicals, which instantly remove hydrogen (H) from the surface proteins, suppressing the action of airborne viruses and removing airborne mold, etc., in the air. This is Sharp's unique technology.