Citizen Men's AV0031-59E Eco-Drive Calibre 2100 Watch Light powered Eco-Drive Caliber E210 Japanese-quartz movement; charges in natural sunlight or indoor light Max power reserve: 240 days; low charge warning: 7 days; charge time from stop state to max charge: Incandescent Light - 150 hours, Outdoors, Cloudy (10,000 Lux) - 45 hours, Outdoors, Sunny (100,000 Lux) - 8.5 hrs Durable, hardened non-reflective mineral crystal; case diameter: 46 mm; assembled by hand; 1/5 second chronograph measures up to 12 hours; power reserve meter Stainless-steel case; black dial; date function between 4 to 5 o'clock; alarm function; screw-back case and screw-down crown Water resistant to 660 feet (200 M): suitable for recreational scuba diving