Swiss Legend Men's 30050-BKWSR Karamica Collection Chronograph Black Ceramic Watch Precise Swiss-quartz movement Sapphire crystal; polished black high tech ceramic and stainless steel case and bracelet Chronograph functions with 60 second, 30 minute and 1/10 of a second; date function White mother of pearl dial with silver luminous hands and hour markers; unidirectional bezel; screw down crown Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving