Custom LED high-appearance building block lights, let your building brick shine colorful light. All bricks have an on/off switch and are fully dimmable. Press and rotate 90° to turn on/off the light. The shell is made of the same safe and durable ABS plastic as the classic brand. Durable, odorless, safe and suitable for children. Built-in Button cell, power switch, can be long time light with repeated use. When the battery runs out of power, you can buy a Button cell to replace it, saving you the cost of buying multiple sets of light bricks. Cell type: LR 41, 1.5 V.