Runs on Most Any Liquid!
The Hydro Calculator runs on water, juice, soft drink, etc...no batteries needed!   This amazing environmentally friendly calculator runs on water or other electrolytic fluids.  It's completely safe, pollution free and is a fully functional calculator!  Instructions and "fuel" applicator enclosed.  Not for children under 3 years old.

How does it work?  The internal converter extracts electrons from the fluid molecules and provides a steady stream of electricity to generate power for the calculator.