There is no ON/OFF button for this item; it works simply by shaking it! Hold the Rocket Lamp in your hand and shake it to see a magical light show. The lights make a smooth transition from color to color illuminating each sparkle; the sparkles only move as much as you agitate the lamp. The LED lights stay on for 1 minute after shaking. The base for this item is Blue Dimensions: Height: 6 in. 15.24 cm. Width: 1.75 in. 4.445 cm. LED Colors: 1 Red, 1 Blue, 1 Green Includes 2 replaceable AG13 Batteries.