Philip Stein Men's 'Prestige' Swiss Automatic Stainless Steel and Leather Watch, Color:Black (Model: 12A-BW-AB) Swiss automatic movement Stainless steel, 52x35mm Double curved spherical sapphire crystal with anti-reflecting coating The proprietary natural frequency technology inside Philip Stein watches and jewelry is tuned to pick up natural frequencies that are believed to be beneficial to life and overall well-being Water resistant to 165 feet (50 M): suitable for swimming and showering