Description: Case material: alloy Strap width: 20mM Strap circumference: 220mM Waterproof: 30M life waterproof Movement type: mechanical movement Strap material: stainless steel Table mirror material: mineral strengthened glass Dial: Fully hollow dial Dial diameter/thickness: 40mw/14MM Package includes: 1*mechanical watch feature: 1. No fading: high temperature forging, electroplating and coloring, it will last forever. 2. Scratch resistance: high-quality materials, high hardness, hand-polished, and the quality is as solid as a rock. 3. Do D material: solid cutting, solid one. 4.30 meters life waterproof, you can wash your hands, splash water and get in the rain every day. How to use mechanical watches: Mechanical watches are powered by arm movements. Everyone, when you receive your watch, wind it up 20 times first, because the watch is stationary during transportation. The crown does not need to be pulled out, and it rotates 20 times clockwise, and the sound of sizzling is winding. Suggestion: White-collar workers do not exercise a lot. In order to ensure accurate time travel, they have to manually supplement 10 laps of power every day. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.