How to maintain this mechanical watch? 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. Transparent Caseback, Exquisite Visible Movt Transparent caseback 30mm Self-produced mechanical movt Cal.A4610 , 80 hours power reserve, frequency 4HZ(28800 v.p.h)Equipped with 27 ruby bearings,two-way winding system,blue steel screws decorations, advanced ring Geneva pattern polishing. 316L Stainless Steel Case In the planning, design, precision machining & production of the 193 process, it gradually came to life.Through 32 hours of processing carving, it eventually condensed into 34g thin case on your wrist, thickness only 11mm. Italian Cowhide Leather Strap Combined with German stiching technology & handmade oil edge, embossed calfskin leather is soft and delicate.Single folding clasp buckle AGELOCER brand exclusive single folding buckle, stylish and generous, create a comfortable wearing experience for you.