SURVAN Mechanical Swiss Sapphire Reinforced Windproof Genuine Leather Day of the Week and Month Business SVA0004 Men's Watch, Hand-wound Watch,

[Design] High-end business-style multi-hand display dial, visible movement movement, feel the time moving, 6 hand-made diamond decorations, Roman numeral display dial [Functions] Luminous hands, day of the week, month, calendar, 50m water resistance [Material] Swiss quartz, sapphire-reinforced windproof glass, alloy case, genuine leather strap [Size] Case: 44 mm, Belt width: 22 mm [Warranty] One year warranty period specification Crystal: Sapphire. Case material: Stainless steel. Band material: Genuine leather. Band width: 22.00mm. Case diameter: 44.00mm. Waterproof depth: 100m. Automatic Watches Automatic watches do not run on batteries. An automatic watch is made up of around 130 or more parts that work together to tell you the time. A self-winding movement, also called a self-winding movement, harnesses the kinetic energy of your arm's swing to power a vibrating rotor that makes the watch tick. It is considered more satisfying to watch collectors (horologists) because of the engineering artistry that goes into the hundreds of parts that make up the movement. If you don't wear your automatic watch consistently (around 8-12 hours a day), you can keep it powered by manually winding it.