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 7549 turnout mechanism (K) or the 74490 turnout mechanism (C). The control box comes with 8 sockets on the back and a plug on one end and a socket on the other end. 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″.