This Omega is 44.25 mm blue ceramic case, transparent back, bezel ring with Liquidmetal™ tachymeter scale, scratch-resistant sapphire crystal anti-reflective treatment on both sides, blue ceramic dial includes 18K white gold indexes and hands, tachymeter scale, Caliber Omega 9904 self winding movement with chronograph, chronometer, moonphase, approximately 60 hours of power reserve, blue leather strap. Water resistant to 5 bar (50 metres / 167 feet).