Information below provided by Woodland Scenics:

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.
Powering Your Light System- You will need one Just Plug Power Supply (JP5770 - see our store) to power up to 50 lights on your light system. RoHS compliant

Kit includes:

• 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
• Illustrated Instructions