Cobalt CDU Solenoid Accessory Decoder (8 Way)Cobalt CDU Solenoid Accessory Decoder (8 Way) with Power Off Memory and Protective Case There's a CDU built in to each output yet it stores all its power on board so does not drain your DCC track power! Each channel also has a digitally addressable relay which has multiple uses including frog power control. Packed with features including a CDU discharge button, Panel LED or Signal Control, Push Button Option and Frog Power Switching. Size Width 217mm