MFRESH Mini Black AT50 Adjustable Ozone Ionizer, Air Purifier, Air Cleaner, With 30 Minutes Auto Off Feature New Feature: 30 Minutes Auto Off Ideal for Small-Medium Space: Cover all angles up to 323sq.ft. Adjustable ozone output 10-50 mg/hr Quiet and Low Consumption Operation: Whisper quiet operation generate noise less than 34 dB, and consume power less than a light bulb Disinfection and Remove Odors: Unlike chemical perfume simply cover up malodorous air, it actually removes stale, bad air and cigarette smoke, destroys mold, bacteria and viruses, no corner left behind. Mini Unit and Wide Input Voltage Range: a small unit could fit in a filled suitcase, with AC 110-240V input voltage that you could travel the world with.