Highlights - 1.System Compatibility - This marble run set works with marbles up to 16mm in diameter. In addition to the marbles included, kids can mix it up with marbles from other brands for endless racing fun and exploration! 2.Electric Lift - This marble race track includes an electric lift and glow-in-the-dark marbles. Simply add two 1.5V AA batteries (Not Included) to power it. The lift adjusts to the highest block height and smoothly transports marbles onto the track automatically. 3.Fun 3