To activate the Mini Mood Cube press the button on the bottom of the Deco Cube. LED Functions: Mini-Mood-Cube can be set to 7 different colors or a slow transition from color to color. Dimesions: 2.75 x 2.75 x 2.75 in. LED Colors: Red, Blue, Green Batteries: Comes with 3 Replaceable AG13 Batteries