I . Brand Information A s a fashion watch brand, BINLUN has its own mixed western and oriental art culture, years of R&D experience and wealth manufacture strength features, targeting to build a customer favorite fashion brand by gathering the essence of classic models of high-end watch and jewelry brands and combining with Chinese culture. What you have not just a timekeeper watch, it is also an art craft. II. About Automatic Mechanic Watch A mechanic watch uses a mechanical mechanism to measure the passage of time, as opposed to modern quartz watches which function electronically. It is driven by a spring (called a mainspring) which must be wound periodically. An automatic wind watch is a watch that powered by the swinging of your arms to keep the watch ticking. If you do not wear an automatic watch consistently (for about 8 to 12 hours a day), you can keep the watch powered with a watch winder (a great gift for collectors). III. Product Introduction BINLUN, BL0020 cool steel and soft leather match design, bringing you a different feeling of watches. Polished silver tone round bezel brown genuine leather band, deployment double push button hidden clasp. Silver color dial face encased by a high strength scratch resistant sapphire crystal, contrasting big Roman numerals hour indexes. White dial with two sub dials presenting GMT 24-hour format and seconds, which is useful for those who has lost the sense of A.M. or P.M. Luxury 21 jewels ruby bearings uses Japanese automatic self-winding movement ensuring more precising timing. Water resistant to 50m(164ft), you don't need to worry about getting some water. IV. Package Including 1 * Men's Watch 1 * Gift Box 1 * User Manual 1* Cleaning Cloth Japanese Automatic Movement Powered by imported Japanese Miyota 21 Jewels automatic mechanical movement , this men's watch provides precise time keeping. The mainspring can self wind with the motion of the wearer's wrist. With transparent caseback, you can enjoy the beauty of mechanical movement. Read more 50M Water Resistant and Scratch Resistant Synthetic Sapphire Waterproof abiltiy to 5ATM, you can wear it you are swimming, having shower, and snorkeling, but not scuba diving. Synthetic sapphire is anti-scratch, it keeps the watch face as clear as brand new after long time of wearing. Read more Genuine Calfskin Replaceable Leather Strap The strap is made of high-quality calfskin, which is gentle to the skin and strong in water resistance. It can be worn on the wrist even in summer. The belt material is soft, not easy to leave creases, and the surface is not easy to break. GMT 24 Hours Sub-dial The left sub-dial display 24 hour format time. It is useful for those who has lost the sense of A.M. or P.M. Suitable for Various Occasions With Roman numeral indexes and skeleton tourbillon display window, it is a combination of classic and fashion, an eternal design it is. It can be a casual watch for daily wearing, a dress watch at business meeting, a sports watch for military action. Read more