Electronic ink is a proprietary material that is processed into a film for integration into electronic displays. Revolutionary in concept; electronic ink is a fusion of chemistry; physics and electronics to create this new material.Band Color : Black Polyurethane; Band Width : 23mm near case; 23mm near clasp/buckle; Bezel Color : Black; Case : Silver + Rectangle-shaped; Case Finish : Polished + Stainless Steel; Case Thickness : 12mm; Case Width : 33mm; 33mm with crown; Clasp / Buckle : Strap Buckle; Dial : Black-and-white + digital; Hand Color : Black-and-white; Movement : Other + quartz; Time Zones : Single; Water Resistance : 5 atm; Other Features : Date and Month Display