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Feature

Built-in button battery, power switch, long time light.
White light: 4 Pack; Red and blue are alternately flashing: 4 Pack.
Compatible with all major brand bricks,Children's favorite building blocks.When it's dark, your children can light up their building blocks.
Can be reusable lighting blocks, don't worry about no electricity.Removable battery,Battery model : LR 41, 1.5 V, X 2 PCS.
This is a transparent building block like crystal.High quality brick, high transparency and pure materials.