Philip Stein Women's 'Signature' Quartz Stainless Steel and Leather Casual Watch, Color:Black (Model: 1-MB-ZB) Quartz movement Stainless steel, 42x27mm Sapphire-coated curved mineral crystal 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 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion