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Built-in button battery, power switch, long time light.
White light: 4 Pack; Red and blue are alternately flashing: 4 Pack; Colorful light: 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.
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.
Sawaruita Light Building Bricks City Friends Architecture Creator Games Supplement Sets Classic Clear Transparent 2x2 Bright Bricks Compatible with All Major Brands Kids Games B07H9R4K57