Item type:tetris lightWeight: 700gSpecification of each cube: 4*4*4cmQuantity:7 cube/setMaterial: plasticlight sources: LEDvoltage: 220VOutput :DC5V 500mA Features:1.What a wonderful idea! Tetris piece shaped lamps that you can stack. 2.Of course、 it's no problem for you to stack them. Take them and try! 3.If you make a straight line、you'll get points、 but then your lamp will disappear! 4.Seven-piece interlocking light fixture for fans of Tetris 5.Pieces can be stacked in any combination 6.LED light turns on when the pieces are stacked together and stays off when dissembled. 7.. Stimulate your kids imagine、 make your kids happy8.. each tetris is 4cm(W) x 4cm(D) x 4cm(H). total 7 piece9. suits 0-3 year kids. Note: 1.parents accompany kids when playing2.As long as one of the main block (blue one) connected to the electric power supply、 Other piled up can shine.