Kikkerland are at the forefront of innovative gadget design and this hydro powered calculator proves it! With three water activated batteries, moisture is required to activate the carbon particles to produce energy. Emitting the same amount of energy as normal batteries, these non-toxic alternatives fix in to the top of the calculator and power the cool clear, green buttoned mathematical gadget.
- This is not a toy
- Suitable for ages 14 years plus
- Measures 13cm x 7.5cm