Citizen Men's BJ7005-59E Eco-Drive Nighthawk Black Watch Light powered Eco-Drive Caliber B877 Japanese-quartz movement; charges in natural sunlight or indoor light Max power reserve: 180 days; low charge warning: 3 days; Quick start ability; charge time from stop state to max charge: Incandescent Light - 53 hrs, Outdoors, Cloudy (10,000 Lux) - 17 hrs, Outdoors, Sunny (100,000 Lux) - 6 hrs Black ion plated case and bracelet; durable, hardened non-reflective mineral crystal; performs flight calculations with Pilot's slide rule inner bezel ring operated by crown at 8 o'clock Large luminous hands and hour and minute markers for easy readability; dual-time function; date feature at three o'clock Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving