The water powered calculator does not require batteries or recharging, just add water. Unscrew the tube at the top and fill with tap water with the squeeze bulb provided, wait a few minutes and the calculator will become useable. One fill operates the calculator for at least one month. Provides a full range of basic functions.
- Water powered!
- No batteries.
- No electricity.
- Innovative and unique.
Price : $11.99
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