8 digit water power calculator working without battery(eco-friendly) decorative calculator gifts big place for LOGO

water power calculatorworking without battery(only need some water)digit calculator

1pcs/160*90*35mm80pcs/55*38*38cmG.W(KG):12.5Box:white box

function

purpose used that four fundamental operations of arithmetic

percentage and memory calculation

square root and power calculation

auto power-off

principle of water power battery:

The product used in everyday life offers the user an environmental design solution. It is a groundbreaking development that portable power technology operated by an inexhaustible resource - "water". The  technology utilizes two electrodes consisting of specially formulated alloys, positive and negative. When they are immersed in water an electrochemical reaction takes place resulting in the production of electrical energy. To maintain a constant supply of energy simply refill as the water evaporates every 2 to 3 months. The water battery

has a minimum continuous life of at least 2 years. In addition to this, the water battery (unlike all other conventional batteries) can be stored in its dry state indefinitely and can be left to dry out at any time during its life.

water power calculator