Citizen has been a world leader in watches since 1924. Using eco-drive technology, many of these watches contain a light sourced rechargeable battery instead of traditional batteries. These watches charge themselves with any available light and will maintain a charge with no light source for six months. Citizen also has radio controlled timepieces that receive standard time radio waves in Japan, US, Germany and China that will automatically adjust the time as you travel. Jet-setters love the light weight titanium encased Citizen Satellite Wave watches which adjust time anywhere in the world via satellite. Traditional quartz watches are available for those with a tighter budget. You get the same high Citizen quality and standards with a traditional battery.