Night Lions Tech(TM) 81 PCS green box funny electric brick Gear Building Toy Set Interlocking Learning Blocks Motorized Spinning Gears Toys. Gears Gears Gears!!! by X Toys 81 PCS green box funny electric brick gear building toy set Interlocking learning blocks motorized spinning gears toys. Gears Gears Gears!!! Package include 81 piece.one box block can change to hundred of different shapes It can develop childrens' thinking skill,improve kid's hand operated ability Battery: 1 'AA' Battery(not include). Every Gears every creation is a moving experiment!