This is a versatile mechanical storage unit with 22 built-in LEDs. Each of the 7 wall panels and 4 floor panels incorporates 2 LEDs. A circuit board is placed on the back of the floor panels, allowing LEDs to light up simply by plugging into the board. Power can be easily supplied by connecting a USB Type-C cable. Power can also be supplied from a mobile battery or smartphone via USB Type-C. All wiring is pre-assembled inside the cover, making it easy for anyone to enjoy base play. Additionally, two units can be connected side-by-side (power supply required for each unit).[Contents]• 7 wall panels• 4 floor panels• 1 USB Type-C cable