IC Housing, 2-3/4" Aperture with Built-in Integral Transformer Measurements Overall Length: 5"Overall Height: 5" Lamp Type/Max Wattage Maximum Wattage: 50 WATTS Lamp Type: MR11 OR MR16, 12V Transformer 60VA, Class 2 Electronic built-in to unit with overload protectionUnique design of Transformer allows unit to be used with regular incandescen dimmers.Note:(Not for use with RadioRa dimming system by Lutron) Notes Compatible Trims: SEE ARLV4000 SERIESCeiling Access is requiredSuitable for damp location and for use in suspended ceilings. ?