Toysmith Enviro Battery The Enviro Battery is one of a series of science projects provided by Toysmith. The enviro battery uses natural materials, like mud, lemons and water to activate a light bulb, watch, or sound chip.

Includes:

• 4 zinc plates
• 4 copper plates
• 4 connection wires
• 2 plastic cups
• 1 paper cup
• 2 specially-designed bottle caps
• 1 light tower with LED
• 1 sound chip
• 1 LCD watch face
• Adhesive tape
• Experiment instruction guide with log

Requires some household items. Age 8+.