Keeps running reliably, even in the dark. Power reserve can last from 6 months to 5 years (depends on model). Under normal conditions in door and outdoor, there is ample exposure to light to keep the watch running - forever. Powere by any kind of light, so it can run and recharge continuously. The ultimate convenience - no battery to replace ever! *There areexceptions which run less than six moths without light. Thanks to our power saving function, CITIZEN makes it possible to develop watches that can operate for up to seven years without light. One of the factors that distinguishes CITIZEN’ s Eco-Drive from other methods of keeping watches running at all times is its “power life.”Eco-Drive watches continue running for more than six months* on a full charge, even in total darkness. Light itself is the only energy source required to tell the time with an Eco-Drive watch. Easy to charge even in Dim LightĮco-Drive is designed so that any light source, no matter how dim, will generate the energy needed to power the watch. ![]() ![]() Watches with Eco-Drive do not require any battery replacement, charging or winding to maintain constant operation. Watches Powered by Light Eco-Drive is designed to convert both natural and artificial light into energy to power watches. In 1976, we invented the world’ s first light-powered analog quartz watch that runs using only light as a power source.
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