Citizen World Time watches - as the name suggests - offer the user the ability to check the time in 30 time zones across the globe. World Time watches have been a long favorite of not only people who travel a lot, but common folk amongst us as well. They have a different appeal to them - the ability to tell the time in almost all major cities around the world is not just a useful feature but also something that adds to the beauty and appeal of the watch. Many Citizen World Time watches feature the eco-drive technology which means you never have to change the batteries of the watch. The watch will charge itself in sunlight or indoors. Some of the models also feature radio controlled time keeping - these watches will sync with the atomic clocks in Europe, USA, Japan and China so they will always be accurate to the milli-second!