Citizen Men's JR3155-54E Eco-Drive Black Ion-Plated Skyhawk 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 Black ion-plated case and bracelet; time and calendar in 22 time zones (30 cities); three world-time alarm functions; One-touch interchangeable analog-digital times 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