Rolex Oyster Perpetual Cosmograph Daytona 116508 sti 40mm 18K yellow gold case, screw-down back, screw-down crown and push buttons with Triplock triple waterproofness, fixed 18K yellow gold bezel with engraved tachymetric scale, scratch-resistant sapphire crystal, steel dial, index hour markers, Rolex calibre 4130 self-winding movement with chronograph central second hand, 30-minute counter at 3 o'clock, and 12-hour counter at 9 o'clock, approximately 72 hours of power reserve, 18K yellow gold Oyster bracelet with flat three-piece links, folding Oysterlock buckle with Easylink 5mm comfort extension link. Waterproof to 100 meters.