Once connected to a power base, each Laser Pegs® shape feeds the next to illuminate an enclosed LED so that these incredible structures light up as you build. These parts are modular and open-ended, and they can all be used with one another. Laser Pegs® unique design makes them compatible with major brand construction toys so that you can bring light into other models. Unique among kids construction toys, Laser Pegs® give the pure joy of creating with light. Laser Pegs® work with batteries and draw very low current. Laser Pegs® are also compatible with other leading construction set brands!