Use the Expansion Hub to connect up to 4 Light Hubs, expanding your Just Plug Lighting System quickly and easily. Includes four Connecting Cables for connecting Lights Hubs. Add an optional Auxiliary Switch for convenient operation. Powering Your Light System You will need one Just Plug Power Supply (JP5770 US, JP5771 Euro, JP5772 UK, or JP5773 Aus/NZ) 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).