Citizen Men's BL5182-51P Eco-Drive Perpetual Calendar Gold-Tone Watch Light powered eco-drive Japanese-quartz movement; charges in natural sunlight or indoor light Durable, hardened mineral crystal Case diameter: 40.5 mm Gold-tone stainless steel case; champagne dial; perpetual calendar, chronograph function Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving