The Luminox Navy SEAL 45mm Quartz Chronograph Watch XS.3581 is a professional diving watch that has been trusted by experts such as Navy SEALs, law enforcement divers, and the US Coast Guard for the past 25 years. This watch is critical in any diving situation and can even make the difference between life and death. The Luminox Light Technology (LLT) ensures that the time is easily visible in all conditions, including night diving, deep diving, or poor visibility. This Swiss-made watch has a constant glow that lasts up to 25 years, making it always visible. It has a diameter of 45mm and is made of CARBONOX™ material. The uni-directional rotating bezel and double security gasket crown ensure the safety of the wearer during any diving operation. This chronograph watch also has a date function and water resistance up to 200 meters or 660 feet (20 ATM). The case back is made of 316L stainless steel screw-on material while the crystal glass material is hardened mineral crystal with a Vickers rating of 550-650. With its genuine rubber strap/bracelet, this watch has a lug width of 24mm and a case height of 14mm. In conclusion, if you are looking for a reliable and durable timepiece for your next diving operation, Luminox Navy SEAL 45mm Quartz Chronograph Watch XS.3581 is the perfect choice.