Add up to four Just Plug LED lights of your choice to a project quickly and easily. Regulate light brightness with individual dimmer controls. Add an optional Auxiliary Switch for convenient operation. Kit Contents 1 - Light Hub - 3 3/8"l x 1 5/16"w x 7/8"d (8.57 cm x 3.33 cm x 2.22 cm) 1 - CTRL Port Plug (installed) Double-sided Mounting Tape 1" x 2 1/2" (2.54 cm x 6.35 cm) 2 Mounting Screws Instructions Powering Your Light System You will need one Just Plug Power Supply (JP5770) to power up to 50 lights on your light system, or if you want to power your system from a train power pack, purchase Connecting Cables (JP5760). Just Plug™ Lighting System No electrical knowledge or special tools needed...just plug and you're done! The Just Plug™ Lighting System is a quick and easy way to add realism and interest to new and existing layouts and other projects. Individual bulb brightness can be controlled, and the modular design allows for easy expansion. Just Plug is compatible with DCC and works for any scale.