To activate your LED center piece, slide the button on the bottom of the base. Fibers & base will glow a steady bright blue light. Fiber Strand Height: 4.0 in. – Fiber Strand Width: 5.75 in. Base Height: 1.50 in. – Base Width: 1.75 in. LED Color: Blue Batteries: Includes 3 replaceable AG13 batteries. – Weight: 0.12 LB