About Tetris: Tetris is always the amazing toy games(One of the most popular) for kids.LED desk Lamp as 3D DIY building block,the players must fit falling blocks together.It is not only stimulate your kids imagine but also make your kids happy.It's real worth to have one or more. What a wonderful idea! Tetris piece shaped lamps that you can stack. Of course, you're going to have to be sure to stack them non-optimally. If you make a straight line, sure, you'll get points, but then your lamp will disappear! Product Specifications: Seven-piece interlocking light fixture for fans of Tetris Pieces can be stacked in any combination LED light turns on when the pieces are stacked together and stays off when dissembled. Dimensions: 7' x 4' x 1' (height and width vary depending on stacked pattern) Power: 110V-220V Weight:0.7kg Power rating:Input 5V DC,500mA For indoor use only.Full instructions enclosed. Bring some magic into your home with the Tetris Light! The 7 individual Tetrimino pieces can be stacked in endless combinations.They magically illuminate when stacked together,but turn off when they are removed from the stack.Mains powered. What's in the box? 1*Tetris Lamp(7 individual pieces) 1*USB Cable