Serene House Essential Oil Wall-Plug Diffusers deliver aromatherapy without the need to add water. The Wall-Plugs Diffusers feature two modes that allow you to customize your fragrance experience. All Serene House's Wall-Plug Diffusers feature rotating metal prongs to guarantee you can use your unit in every outlet in every room. A nightlight with three brightness levels ensures that your diffuser is as functional as it is beautiful.