Radio-controlled: Automatically receives radio signals to precisely adjust the time and calendar Power save function LumiBrite hands and markers Water-resistant to 10 bar, 100 meters (330 feet) Two-tone bracelet with fold over push button clasp Signal reception and result indicator World time function (25 time zones) 24 hour indicator 6-month power reserve Chronograph measures up to 60 minutes in 1/5 second increments with split time measurement function Date calendar Screwdown crown Glass caseback Sapphire crystal 44.5mm case diameter Caliber 8B92 Cabochon crown 3 year warranty on manufactory defects First year world wide warranty, 2nd and 3rd year only for USA