Quiksilver Men's 'Spring Summer 2011' Japanese Automatic Plastic and Polyurethane Sport Watch, Color:Black (Model: QWMT002-BLK) Polycarbonate case Solid stainless steel case back with screws Reinforced faceted mineral crystal Digital tide movement featuring Quiksilver's award winning deep tide system technology - US patent # 7,230,883; 15 years of pre-programmed tide data for 200 spots around the world including the Americas, Europe, Australia, Asia Pacific and Africa Not water resistant