4 inch low voltage IC Airtight new construction housing with magnetic transformer is suitable for insulated ceiling and damp location. Below ceiling accessible. EC50M 50 VA 120V / 12V magnetic transformer included. For use with MR16 bipin base max 50W 12V halogen lamps not included . Compatible with following trims R2000, R2000VSM, R2000VST, R2010VSM, R2010VST, R2020, R2030VSM, R2030VST, R2051, R2100, R2100VSM, R2100VST, R2100VT, R2110VSM, R2110VST, R2120, T2010V, T2000VL, T2010VL, T2000VS, T2010VS, T2000VLS, T2010VLS, R2130VSM, R2130VST, R2450VT, S2000, S2051, S2100, T2000, T2000V. Takes up to 7/8 quot thick ceiling. Cutout 4.25 inch. Dimensions 19.5 inch length, 10 inch width, 7.125 inch height. UL listed.