51mm titanium case, black dial, black rubber strap, scratch resistant sapphire crystal, closed case back, deployment clasp, quartz movement, water resistant to 100m/330ft. Emergency - equipped with a dual-frequency transmitter, the international satellite emergency warning system Cospas-Sarsat.?Cospas-Sarsat serves to signal an alarm.?A revolutionary rechargeable battery, a miniature dual-frequency transmitter and an unparalleled built-in antenna system are three components specifically designed.