Men's Sapphire Luminous Rotatable Bezel Silver-Gold Stainless Seel Band Waterproof Sport Watches Black Synthetic-sapphire mirror,scratch resistant; Unidirectional rotatable bezel,set time for diving; Luminous,more convenient to see the time in the evening Silver-gold stainless steel watch band,it's comfortable to wera; 30 ATM waterproof,swimming, diving and snorkeling is secured.