How to flash the Lego 54930c01 Light Brick - YouTube
LEGO PART 62930 Light Brick 2 x 3 x 1 1/3 with Dark Bluish Gray Base [Yellow LED] | Rebrickable - Build with LEGO
BrickLink - Part 54930c01 : LEGO Electric, Light Brick 2 x 3 x 1 1/3 with Trans-Red Top and Red LED Light [Electric, Light & Sound] - BrickLink Reference Catalog
LEGO 54930c01 Dark Bluish Gray Electric, Light Brick 2 x 3 x 1 1/3 W/ Red Top | eBay