Light Stax (R) Illuminated Building Blocks Classic Set (36 Pieces) Lights up when connected to a power base or any Light Stax Illuminated construction stacking blocks that use LED technology 100 percent compatible with legos and existing traditional building blocks No special connectors or wires are needed Other words customers use to find this product: cool gadgets creator toys for boys and girls lite brix toy ages 3 4 5 6 7 8 9 electric mega brick piece