GUANQIN Women Men Couple Calendar Week Diamond Vintage Japanese Automatic Self-Winding Mechanical Wrist Watch Tungsten Steel Band Sapphire Crystal Waterproof Luminous Clock

Using Japanese automatic self-winding movement with 21 synthetic gemstones stable bearings, frequency 28800 times per hour, it provides a precise time and a storage of energy over 42 hours. It is powered by the natural movement of your wrist, it must be worn at least 8 hours a day, if you do not wear it for a long time, the watch will stop. At this time, you need to recondition the correct time and wear it. Operate the watch, to wind-up please whirl the button on the clockwise for 30 to 40 laps. Watch is with calendar, tell your day and date anytime, anywhere, moreover it's with week and luminous function, it is charming and shining. See-through back cover allows you to observe the work of the movement at any time, feel the passage of time intuitively, and enjoy a different visual experience. Elegant, fashionable and practical design suitable for business, casual, sport or any other occasions, which is a great gift to loved ones for Christmas, birthday, Mother's Day and Valentine's Day. Stainless steel case, through long hours of glossy angled engraving, planning, design, precision machining and production processes made it stand wear and tear. With tungsten steel band and ergonomic design, watch is incredibly comfortable to wear. Whether you are working for long hours or engaging in outdoor activity, it fits snugly on your wrist, providing you with the utmost comfort. Safety double-open butterfly buckle is made of skin-friendly material, convenient to put on and take off. Synthetic sapphire crystal mirror, the hardness is the second after the diamond, not afraid of syringes and breaking, high temperature resistance and super corrosion protection, making your watch more durable and resistant to scratches and refraction. 50M waterproof, perfect for all types of business, casual, indoor, outdoor activities or daily use. In daily life, you can wear it to wash your hands and get in the rain, but please do not wear your watch when swimming, diving or taking a hot bath. Do not use your watch at extremely hot or cold temperatures, which can damage your watch and shorten its lifespan. Keep your watch away from magnets as it can damage the movement.