Citizen Eco-Drive watches use the simplest, yet most technically advanced power generating and storage system in the Watch Manufacturing Industry. A Solar conversion panel and energy cell are the power provider for these Quartz Watches. Eco-Drive's ability to use light from any source to generate electrical power means that the supply is limitless and free. The absence of any added complex power generating machinery that would require additional upkeep is another big advantage.
The Eco-Drive 180 collection means that if your watch is put away where no light is available to it while in a fully charged state, it will have a 180 day power reserve.
To view the Eco-Drive movie click below:
http://citizenwatch.com/CUK/English/ecodrivemovie.asp