The Laser Peg 4-1 power kit includes two power bases so two children or adults can build abstract lighted models at one time. It comes with 60 Laser Peg shapes to build lighted models like sand rails, star ship cruisers along with many others. It even comes with an insert in each box so kids can go out to LaserPegs.com and download up to 14 more models to build! Each 4-1 power kit comes with a 90 day guarantee and two Laser Peg cords to build on the laser peg power base or away from the Laser Peg power base! The fun never ends with the Laser Pegs brand!