Oniss #ON811-M Men's Swiss Black Ceramic Chronograph Watch Precise Swiss Quartz Movement High Tec Ceramic Case and Band, Push Button Butterfly Open Clasp Sapphire Crystal, Date Display, MOP Dial, Luminous Hands and Markers, Chronograph Function Case Size: 42.5mm Diameter, 11mm Thickness Water Resistant - 30M, Screw Fastened Caseback