Perpetual Calendar Automatically Adjusts for Oddand Even Months and Leap Years through 2100 When in calendar mode, second hand points to month on inner bezel Charges in Sunlight or Indoors - No Batteries to Change - Ever! When Fully Charged has a 500 Day Power Reserve Stainless Steel Case & Bracelet with Black Ion Plating 36 Diamonds around Bezel 12/24 Hour Time Dual Time Daily Alarm Day & Date display Screw-Back Case Mineral Glass Crystal 100 Meter Water-Resistant Fold-over Clasp with Hidden Double Push Button Low Charge Indicator & Time Reset Advisory when it needs charging Approximate dimensions: 38mm (1 1/2 inches) wide not including setting crown and 10.5mm thick