From the Essentials Collection. Adding classic automatic timekeeping to the Essentials Collection, this versatile timepiece winds with the movement of the wearer’s wrist, and never needs a battery. Visible through the screwdown see-through caseback, the 23-jewel movement beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 41 hours and manual winding capability. With a sophisticated sunray finish, the blue dial includes a calendar and crisply defined hands and markers. Crafted of stainless steel, with tri-fold push button release clasp. 10 bar, 100M Water Resistant Features From the Essentials Collection Automatic with manual winding capability Blue sunray dial Date calendar Screwdown see-through caseback Tri-fold push button release clasp 21,600 vibrations per hour 23 jewels Specifications Collection: Essentials Gender: Men's Movement: Automatic Band: Stainless Steel Dial Color: Blue Caliber: 4R35 Case Diameter: 41.20mm Case Thickness: 11.77mm Case Length: 48.50mm Case Material: Stainless steel case Crystal: Hardlex crystal Strap: Stainless steel bracelet Water Resistance: 10 bar, 100 meters (330 feet)