Automatically receives radio signals to precisely adjust the time and calendar - Powered by light energy- no battery change required - World time function (25 time zones) - Chronograph measures up to 60 minutes in 1/5 second increments with split time measurement function - Date calendar - LumiBrite hands and markers - Screwdown crown - Glass caseback - Sapphire crystal - Water-resistant to 10 bar, 100 meters (330 feet)