The Zenith Chronomaster Open Watch allows the wearer to see the pulse of the El Primero movement through the dial. The watch comes in a polished 40 mm stainless steel case with a matte black dial with three-color counters and see-through counters for small seconds, and a black rubber strap with Cordura material. 1/10th of a second precision self-winding chronograph movement, El Primero 3604, with 1/10th of a second accuracy.