IT2000CM 4 inch low voltage Non-IC shallow 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. Magnetic 120 volt to 12 volt transformer included. Takes up to 7/8 inch thick ceiling. Below ceiling accessible. One 42 watt maximum, 12 volt GU5.3 MR16 bulb is required, but not included. Dimmable with a low voltage magnetic dimmer. Consult bulb manufacturer for low voltage magnetic dimmer compatibility when using LED bulb option. 4.25 inch ceiling cut out. 13.25 inch length x 5.4 inch width x 3.7 inch height. A complete fixture includes a housing and trim, sold separately.