To activate your LED center piece, slide the button on the bottom of the base. Fibers & base will slowly transition from color to color through the rainbow. Dimensions: Fiber Strand Height: 4.0 in. Fiber Strand Width: 5.75 in. Base Height: 1.50 in. Base Width: 1.75 in. LED Color: Rainbow Base Color: Clear Light Up Small Clear Centerpieces include 3 replaceable AG13 Batteries.