Warmly Tips: Just LED light kit is for sale, Lego brick models is not included in the package This light kit for Lego 21318 Treehouse Collectible Building Model is USB powered supplied. The voltage should be less than 1A 5V to avoid burning. When you install it, you don't have to rip apart all the parts. You can cross and hide the wires under the base and make sure the wires lay between the pegs on your bricks.