"Perpetual Calendar 1/20 Second Chronograph Measures up to 60 Minutes 12/24 Hour TIme Dual Time Alarm One-Way Rotating Elapsed Time Bezel Non-Reflective Mineral Glass Crystal Srew-In Case Back Water Resistant to 100 Meters (330 Feet) Black Ion Plated Stainless Steel Case and Bracelet Eco-Drive Solar Powered Technology so you never have to change a battery 120 Day Power Reserve when Fully Charged Bracelet features a Fold Over Clasp with Double Push Button Release 42mm Case Width not including Crown (Approximately 1 3/4"")"