"Citizen makes a big splash with the new 300 Meter Eco-Drive Professional Diver. This hefty new watch is water-resistant to 300 meters and has integrated helium gas release - making it suitable for the most demanding diving environments. Features include: Solid Stainless Case with Helium Release. Note: this is a big watch! Appox. 46mm (1 7/8"") wide not including crown and a very hefty 18mm (5/8"") thick. 6mm Non-Reflective Scratch-Resistant Mineral Crystal Ratcheted One-Way Rotating Elapsed-Time Bezel 180-Day Power Reserve that Charges in Sunlight or Indoors Screw-Down Crown Reinforced urethane rubber strap with extender strap included for dry suits and thick wet suits. Low Charge Indicator and Time Reset Advisory Water-Resistant to 300 Meters Five Year Citizen Warranty Attractively packaged in a leatherette zippered case with the wetsuit strap extension as shown below:"