Water and Solar Power Calculator(NP-WC089B)
1. 10 or 12 digit wtith big LCD screen.
2. It can run only depending on the power generated by any little liquid such as water, juice, tea, coffee, etc, no need of any battery and button cell.
3. It is a magic high-technology product, also environmental and energy-saving.
4. It can stimulate people to buy and arose people's environmental awareness.