Features: [Compact Structure] Small size light weight, portable to be carried and used from one room to another. [Hold Function] Turn anticlockwise to HOLD to keep operating. Return the knob to OFF model when the treatment is finished. [Timing Design] 2-Hour timer, turn clockwise to set timer up to 120 minutes. The unit will be automatically off when the time on the timer is reached. [Considerable Parameters] 5000mg/h ozone production and 100CFM air flow volume. Excellent technology ensures effective and rapid air purification. [Wide Applications] Suitable for removing pet odors, cooking odors, musty smell, smoking smell, chemical odors (formaldehyde), virus and bacteria in your own house, offices, stores, cars, boats, hotels, restaurants, hospitals, basements, bars, etc.