This is a vintage electronic game sold in the 1970s at Radio Shack stores. Players use plastic betting chips to wager on horses displayed on a circular computer operated game board... actually a 3-D device similar to a Simon game! The race begins when a switch is activated and two sets of lights start to rotate around the board. The moving lights stop randomly. One light indicates the winning horse and the other light indicates the payoff... 2 to 1, 10 to 1, etc. Includes the Derby device, 100 chips, a storage insert, and rules.