TACTBIT Rechargeable Tetris Retro Game Style Stackable Multi-color LED Lamp The lamp includes seven brightly colored lights, in different shapes, which illuminate once they come into contact with each other. All you need is for the main block to be plugged into power outlet or the rechargeable battery has to charged to light up all the blocks. Rechargeable battery powered - no more dangling wire during play - Easy to recharge by Power Charger and USB cable both included with the Lamp This is a perfect gift for all occasions and can be used to add a touch of multi-colored awesomeness to any room in your home or office. Certifications: CE, EMC, FCC, GS, ROHS, UL 3rd Generation of TactBit Original Design - Utility Patent # ZL2012 2 0032018.6