Electric DIY Building Block Cog Set (190 pcs)Bright, colorful cogs stimulate and entertain! A variety of pieces can work together to form hundreds of different moving combinations. A flick of a switch is all it takes to spin all the gears automatically without the need of manually cranking it. Requires x2 AA batteries. Our 190 piece gear toy encourages hours of fun, critical thinking and problem solving. Each set comes with interlocking blocks, gears of varying sizes, merry go round, figurines