To activate the 4 Inch LED Super Bounce Ball, just throw it down on a hard surface. Bright lights will flash for about 15 seconds, then shut off automatically. Dimensions: Diameter 4 inches LED Colors: 1 Red, 1 Blue Ball Colors: Blue Comes ready to use with non-replaceable batteries. Packaging: Retail ready in a 6-piece stylized display box. 36 balls per case.