Powder coated scratch resistant aluminum cabinet. Dial added to control ozone output. Four ceramic plate generators powered by a heavy duty transformer. Comes with operating instructions to assist the operator in ensuring that usage falls within OSHA guidelines. Assembled in the U.S.A. Vacate area during treatment and allow the Ozone to dissipate prior to occupying the room. An amount of time equal to 1/2 the timer setting is adequate.