Citizen Men's Watch Eco Drive Promaster Sky Radio Controlled Chrono Green Lens Category_1 Very Light Tint also gold ion plated also gold ion plated Featuring a Forest green dial and recycled PET textile strap with comfortable cork lining and stitches Citizen Eco Drive technology harnesses the power of light from any natural or artificial light source and converts it into energy which is stored in a rechargeable lithium ion cell Eco Drive Radio Controlled E660 Japanese Quartz Movement 10 Month Power Reserve (3 years in Power Save Function) Tachymeter with Pilot Slide Rule Worldtimer Function UTC time Digital Display of Local and World Time Chronograph Atomic Clock Synchronisation