4" Mini Low Voltage cans and trims for New Construction and Remodel work.The housings include transformers for Low Voltage MR16 Lamps and come pre-wired with a snap in J-box. All housings that are IC rated can be used in direct contact of insulation. Non-IC have to have at least 3" of clearance from insulation. Airtight and NON airtight units are available. UL Listed for feed through wiring and damp location.Accomodates up to 50W 12V MR-16 with proper lamp.