The Citizen Professional Diver Watch is the ultimate diver's watch. The Professional Diver is fully equipped with Eco-drive movement, water resistance at 660 feet and amazing power reserve. This timepiece is a diver's best friend! Solid Stainless Case with Helium Release. Stainless Steel Bracelet with push-button triple-folding safety clasp. 6mm Non-Reflective Scratch-Resistant Mineral Crystal. Big, luminous hands and markers for low-light visibility. Ratcheted One-Way Rotating Elapsed-Time Bezel. 180-Day Power Reserve that Charges in Sunlight or Indoors. Screw-Down Crown. Low Charge Indicator and Time Reset Advisory. Water-Resistant to 300 Meters. Note: This is a big watch! Appox. 46mm (1 7/8") wide not including crown and a very hefty 18mm (5/8") thick.