Masall White Mini Air Purifier Portable Ozone Generator Air Cleaner for Bedroom Refrigerator Toilet Ozone Sterilize: Produce Ozone Molecules Can Kill The Bacteria , Food and Other Goods, Decompose and Remove Odor, Inhibit The Growth Of Bacteria. Power Source: Four AA (No. 5) Alkaline Batteries or USB Operation: Microcomputer Control and It's So Easy Operation. Powered by Mini USB Cable, Connected With Computer or Power Bank Small: Product Size: 94 * 95 mm / 3.70 * 3.70 in Material: ABS, Size: 3.70in * 3.74in, Ozone Output: 3mg / H Scope: Refrigerators, Clothes Shoe Room, Bedroom, Desk, Study, Pets, Toilets, etc.