["[TSAR BOMBA-Exploring the Unknown X] TSAR BOMBA mens watch features a novel double-arch bridge tonneau-shaped case design with a personalized skeletonized oil-press texture combined with three simple and practical chronograph dials which are stylish and very flattering to the wrist. The mirror is made of imitation sapphire glass which fits perfectly with the 316L stainless steel case. Also the A-grade luminous function allows you to see the time at night without hurting your eyes." [Quick Release Strap-Fluoroelastomer] Upgraded with "Quick Release Fluoroelastomer Strap". The fluoroelastomer strap measures approximately 22 cm (8.66 in) in length and 2.2 cm (0.86 in) in width. It is more anti-allergic waterproof and sweatproof comfortable breathable and wear-resistant than silicone straps. It is also easier to remove and replace the new watch band with just one poke and slide. [Waterproof 50M (164FT)] Suitable for everyday water resistance the watch can withstand sweat rain or accidental splashes of water but not for swimming or diving. Be careful not to get into the hot water! Excessive temperature difference will cause the waterproof rubber ring to expand and contract and it is easy to enter the water. This affects the water resistance of the watch. [Japanese Quartz Movement ]Super quality quartz movement stable operation and accurate recording reminding you to use every minute and every second efficiently. The watch case adopts IP plasma plating which is not easy to fade durable and bright in color.]