Atlas Sound AT35 35 Watt Plate Mounted Attenuator, Set of Four 35W Single Gang Stainless Steel 70.7V Commercial Attenuator. 10 attenuation steps plus positive off. Mount into Most 1-Gang E.O. Boxes. Wall Plates are Stainless Steel with Stamped and Filled Dial Scale and a Skirted Black Knob. UL Listed.