Mobile Set includes: 1 rechargeable battery brick 1 USB cable and 4 transparent white square bricks Each block lights up as you link it to any block connected to the power source Manufacturered by Light Stax. Compatible with the Light Stax hybrid series and Light Stax Shine/Fantasy sets Not compatible with Light Stax Classic or Light Stax Creative model lines Mobile Power Set to take the fun anywhere! Compatible with Lego sized bricks