Citizen Men's BL5374-51A Eco-Drive Perpetual Calendar Chronograph Sport Watch Light powered Eco-Drive Caliber E81* Japanese-quartz movement; charges in natural sunlight or indoor light Max power reserve: 120 - 270 days with Power Save; low charge warning: 5 days; charge time from stop state to max charge: Incandescent Light - 43 hrs, Outdoors, Cloudy (10,000 Lux) - 12 hrs, Outdoors, Sunny (100,000 Lux) - 4 hrs Durable, hardened non-reflective mineral crystal; case diameter: 46 mm; 1/20 second chronograph measures up to 60 minutes; 12/24 hour time with 24-hour sub dial; dual-time function Two-tone stainless steel case and matching bracelet; white dial; perpetual-calendar function; alarm function; screw-back case Water resistant to 660 feet (200 M): suitable for recreational scuba diving