Enjoy Hours Of Fun And Learning With The 4M Kidzlabs Tornado Maker Science Kit. Recycle An Empty Bottle To Construct This Battery-Operated Tornado Maker. Amaze Friends And Family With This Mighty Power Of This Natural Phenomenon. With A Plastic Bottle Filled With Water, Create A Terrific Tornado On Any Tabletop. Assemble The Set With Cross-Head Screwdriver And Power With 2 Aa Batteries, Sold Separately.