LEGO Transparent Red Electric Light Brick 2 x 3 x 1.3 Red (38564 / 54869) | Brick Owl - LEGO Marketplace
Amazon.com: Sawaruita Light Up Building Bricks Multicolor LED Light Brick Sets Classic Transparent 2x2 2x3 Building Block Accessories Kit Toys Compatible with All Major Brands : Toys & Games
Lights for LEGO, no battery, no wires to bricks -- i-Brix! 💡 - YouTube