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Eco-Drive converts any kind of light into energy to power a watch, storing the surplus on a power cell. On a full charge, an Eco-Drive watch runs for months even in darkness with no need for regular battery replacement. It’s designed to charge from ordinary everyday light sources like indoor fluorescent lighting and desk lights. You can go about your everyday life confident that your watch will never stop. Light-Powered Technology Solar cells absorb light and convert it into energy. With Eco-Drive, we use different solar cells for different models to increase the range of designs we can offer.