3.5 Inch Remodel Line Voltage Non-IC housing for areas without insulation. Internal thermal protection. Requires one 50 watt maximum 120 volt GU10 MR16 halogen lamp, not included. Can also be used with one2 watt 120 volt GU10 MR16 LED lamp, not included. cUL listed. For use with trims X3501, X3502, X3503, X3504, X3505, X3507 and X3508. Dimensions: 10.5 inch length x 4.6 inch width x 4.6 inch height. 3.622 inch ceiling cut out.