Citizen is recognised as a leading Japanese brand and is globally known for it's advanced technology. Citizen carries two ranges, Quartz and Eco-Drive. The Eco-Drive series showcases the advanced technology Citizen is known for. The Eco Drive series is run by artificial and natural light- never ever need a battery. Natural and artificial lights are absorbed through the dial, a special solar cell converts the light into energy. Citizen's high quality pieces range in many different styles and many models carry special features such as sapphire crystal glass, perpetual calendar, and radio control. Citizen Eco-Drive has a 5 year warranty.