This control box is for operating 4 double solenoid accessories with end shutoff contacts. It has an automatic feedback of the accessory setting by means of LEDs when used with the 75491 turnout mechanism (K) or the 74491 turnout mechanism (C) as well as the Minitrix 14934 and 14935 turnout mechanism. The control box comes with 8 sockets on the back and 2 sockets on the ends. All of the connections are for the new plugs from the 71400 sets. 8 appropriate plugs included.Dimensions 80 x 40 mm / 3-1/8" x 1-9/16".