Citizen Men's BM6640-57E Eco-Drive Diamond Accented Dress Watch Imported Light powered eco-drive Japanese-quartz movement; charges in natural sunlight or indoor light Durable, hardened mineral crystal Case diameter: 32 mm Stainless-steel case; black dial; date function Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion