Swiss Legend Men&#39;s SL-30050-BKBGR Karamica Collection Chronograph Black Ceramic Watch Precise Swiss-quartz movement Scratch-resistant sapphire crystal; polished black high tech ceramic case and bracelet Chronograph functions with 60 second, 30 minute and 1/10th of a second sub-dials; date function Black mother of pearl dial with gold-tone hands and hours markers; luminous; gold-tone pushers and screw-down crown with black cabochon Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving