A simple on/off switch for those that would like a switch between the power supply and the display or dollhouse. Simply insert the plug from the power supply into the jack of the cord and then insert the plug from the switch cord into the power connector of the dollhouse. Switch and cord are black. The plug and jack are 5.5mm x 2.1mm which is the same as that on the power supply. I recommend sanding the back of the switch and then glue the switch to the side of your dollhouse base.