Coutura Collection Solar, Radio sync solar chronograph, Radio controlled: automatically receives radio signals to adjust time and calendar, Powered by light energy - no battery change required, 6-month power reserve once fully charged, World time (25 time zones), Green sunray dial with gold accents, Signal reception and result indicator, LumiBrite hands and markers, Sapphire crystal, Glass caseback, Stainless steel case and bracelet with gold accents, Water resistant to 10 bar, 100 meters (330 feet).