0-TYSM3644 Green Science Enviro Battery <p><font color="00ff66" size="2" face="Arial, Helvetica, sans-serif">Learn the science behind the Power! Enviro-Battery uses natural materials like mud, lemons, and water to power a light bulb, a watch, and activate a music chip. An amazing, environmentally friendly science kit that includes detailed instructions so you can create many unusual batteries with fruit juices, vegetables, coins, utensils, and more! </font></p>