It starts with a simple, yet revolutionary concept; a timepiece that never needs a battery change.
Citizen Eco-Drive technology harnesses the power of light – from any natural or artificial light source – and converts it into energy which is stored in an Eco-Drive energy cell.
It recharges continuously in any kind of light to run forever.

Natural and artificial lights are absorbed through the dial.
A special solar cell converts the light into energy.
Enough energy is stored to power the timepiece, even in the dark, from 135 days to 7 years depending on the model.