Automatic mechanical movement 30m waterproof Transparent design of dial Luminous pointer Novel appearance design Model: sb08yt21-649689758729 Strap color: Black (refer to the main figure) Dial color: black (refer to the main figure) Dial shape: square Thickness of watch disc: 12mm Diameter of watch disc: 42mm Watch band width: 22mm Steel strip length (including watch disc): 150-220mm Steel belt buckle style: snap fastener Waterproof performance: 50m (bathing, raining, swimming) Movement type: automatic mechanical movement Strap material: stainless steel Case material: alloy Mirror material: mineral reinforced glass Applicable population: teenagers and men Display type: pointer Style features: high end, fashion, leisure and trend Weight: 145g Package size: 14*10*8cm Package weight: 250g Package: watch x 1 Note:The fully automatic mechanical watch needs to generate power through the pendulum and wind up automatically. It is recommended to wear it for more than 8 hours every day.