Just turn on the switch and the ingredients will diffuse into a room of 10.7 - 12.7 sq ft (4.5 - 12 tatami mats). (*This product is for replacement, so it is necessary to purchase the main unit separately. It turns the unpleasant smell of pet odors, and pet odors in a room such as pet odors and feces into a pleasant fragrance. Effective lasts for approximately 60 days when used 24 hours a day.