Citizen Men's JR3000-51F Eco-Drive Skyhawk Chronograph Watch Light powered Eco-Drive Caliber C650 Japanese-quartz movement; charges in natural sunlight or indoor light Max power reserve: 90 days to 4 Years with Power Save; low charge warning: 1.5 days; charge time from stop state to max charge: Incandescent Light - 29 hrs, Outdoors, Cloudy (10,000 Lux) - 9 hrs, Outdoors, Sunny (100,000 Lux) - 5 hrs Durable, hardened mineral crystal; case diameter: 44 mm; time and calendar in 22 time zones (30 cities); three world-time alarm functions; One-touch interchangeable analog-digital times Stainless steel case; black dial; 1/100 second chronograph measures up to 24 hours; 99 minute countdown timer; rotating slide rule bezel; Screw back case Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving