OWI Robotics X in 1 Renewable Energy Kit, 115 Pieces, Ages 8+If you are familiar with OWI products, you are well aware of the Mini Solar Kit line. For almost 4 decades award winning kits have followed one another in succession. This year OWI supplemented a new renewable energy source, the Hand Generator. With in 1 Renewable Energy Kit (X meaning 10), scholarly children will construct ginormous kits with child friendly parts that function indoors with use of a Hand Generator, outdoors with the use of the XL