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Just add water to the cell to activate the device and enjoy the free power supplying the calculator. It is enough to change the water in the cell only once every 3 - 6 months, and replace the cell after 2 - 3 years.
The calculator is made of biodegradable plastic, which makes it environmentally friendly and easy to recycle.
|Dimensions||10.5 x 6 x 1.2 cm|