IT2000E 4 inch low voltage Non-IC remodel housing is equipped with thermal protection and is suitable for damp locations. Cannot be used in contact with insulation and should be at least 3 inches from insulation. Electronic 120 volt to 12 volt transformer included. Takes up to 7/8 inch thick ceiling. Below ceiling accessible. One 50 watt, 12 volt GU5.3 MR16 bulb is required, but not included. Dimmable with a low voltage electronic dimmer. See attached manufacturer dimmer compatibility reference when using LED bulb. Suitable for damp locations. UL listed. 4.25 inch ceiling cut out. 13.6 inch length x 5 inch width x 4.6 inch height. A complete fixture includes a housing and trim, sold separately.