Downlighting Low Voltage Recessed Housings: Housing Type - Recessed Downlight; Lamp Type - 12V MR16; Nominal Aperture - 4" Round; Installation - Remodel; Ceiling Type - Non-Insulated; Air Rating - Non-Airtight; Transformer - 120V Magnetic; Depth - 5.50" (140mm); Ceiling Opening - 4.50" (114mm); Manufacturer Series - H1499