Now with 25% more fragrance impact, which makes it even better for larger rooms! With adjustable intensity for smaller rooms or lighter scenting and up to 4 - 6 weeks of fragrancing, these UL listed units are ideal for every room in your home. Plugs into any standard 120 volt outlet (vertical or horizontal) -- leaves one outlet free. Includes heating unit, shade and scented oil. Refills sold separately.