LOBINNI Automatic Watches For Men Luxury Fashion Stylish. LOBINNI Mechanical watch is a men's fashion watch that does not have the trouble of changing batteries.，it supports automatic and manual winding，rotating crown 20-30 turns every day,can better maintain the accuracy of the time. The self-winding system is a system that gets power by mounting it on the arm and automatically winding the internal spring with the force of the arm shaking. It has a good quality texture, and the more you use it, the better it fits on your arm. Possible Reasons for the Automatic Watch Stops Working or the Time is Slow And precautions When using for the first time, please manually wind up the watch to get enough energy to keep it working well, energy dial shouldn’t exceed 35. If you wear the watch less than 8 hours a day, please manually wind up your watch to keep working well. Please avoid wearing it in hot water or under thermal steam environment, such as hot bathing, hot springs, sauna, etc. Battery free, as you wear it, it will automatically continue to wind up. If you wear it more than 10 hours a day, you won’t never to manually wind up your watch. The Watch Be Shocked: When the watch is hit, some parts inside may become loose, causing the watch to slow down or not to walk. Take off the watch when playing golf, tennis, boxing and other sports, and don’t shake it hard. Watches Are Magnetized: Watches are magnetized, which is one of the common causes of slow watches Lack Of Maintenance: mechanical watches need to be maintained regularly, usually every 2-3 years. Artificial Sapphire Crystal The watches' mirror is made of 1.2 mm artificial sapphire and is extremely resistant to abrasion and scratching. The artificial sapphire material is second only to diamond in hardness which can withstand for lifetime using and remains flawless. 316L Stainless Steel Case Forged from 316L stainless steel which has excellent gloss and hardness and strong corrosion resistance. The hardness is much higher than normal stainless steel watches. High-quality materials and craftsmanship to ensure lifetime durability and excellent strength. 30mm Transparent caseback AAA-level fully automatic mechanical movement, frequency 21,600 times/hour, moisturizing number 19, power reserve of more than 40 hours, each movement has undergone four tests to ensure making a high quality watch for you