The Light My Bricks Micro Expansion Slot (Card) features 4 micro-sized connections for attaching LmB Micro Bit lights, along with 2 standard-sized connections for other LmB LED lights. The Light My Bricks Micro Bit lights fit into almost any LEGO piece, allowing even tiny details to be illuminated, which is not possible with the standard Light My Bricks LEDs. The expansion card measures 24 mm x 6.5 mm. With LEGO lighting components, LEGO fans can easily customize their models using LED lights. With a variety of colors, lighting options, and effects, anyone can make their LEGO set shine. All Light My Bricks components are plug-and-play - no electronics knowledge required.