Jacques Lemans Men's Automatic Rose-Gold-Plated-Stainless-Steel Casual Watch(Model: 916O) Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Sapphire crystal Case diameter: 44 mm Rose-gold-plated-Stainless-steel case; blue dial; day-date-and-moon-phase functions Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion