Cooper Lighting Iris® Collection Medium distribution 4-Inch LED open downlight housing features double wall aluminum construction. This square housing has LED lamp that has voltage rating of 120 - 277-Volts. It is insulated air-tite ceiling mountable. It has cut out of size 5-3/16-inches. It measures 15-3/4-Inch x 10-Inch x 7-1/16-Inch. This 120 - 277-Volts constant current driver offers noise free operation. Housing is UL/cULus listed.