Zodiac ZMX Men's ZO8561 Special Ops Stainless Steel Watch Round chronograph watch featuring tachymeter-marked bezel, double-sided crowns, and black dial with luminous hands 50 mm stainless steel case with synthetic-sapphire dial window Swiss quartz movement with analog display Stainless steel link bracelet with deployant-clasp closure Water resistant to 100 m (330 ft): In general, suitable for swimming and snorkeling, but not scuba diving