This fully assembled and ready to use controller mounts on the fascia or control panel. Use for manual throwing of your switches and also provides feedback on servo position when used with DCC/signals. Has 2 yellow LEDs. Mounts using a #4 self-tapping screw (included). Comes with a 12" cord attached. 3-wire servo extensions can be used to extend the reach. By using a "Y" cable, two controllers can be added to one port to provide two control points for one turnout. Controller is 0.6 x 0.8 " in size.