The H2O Water powered accountants calculator is powered by H2O's revolutionary replaceable water-powered battery. It has a 12 digit display screen, making it suitable for both day-to-day and professional use.

How the battery works
H2O's patented technology uses two electrodes made of special alloys which, when immersed in water, trigger a chemical reaction producing electricity.

To maintain a constant supply of energy, simply refill the battery as the water evaporates - typically every two to three months.

The battery has a minimum continuous life of two years.

Replacement batteries are available at £5 per pack of two if you return the used battery with your order.

All Tango H2O water-powered products are energy saving, better for the environment and money saving.

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H2O Water powered Accountants Calculator - ESTANH2OCALCACC