Stainless steel case diameter 42 mm x thickness 12.5 mm; Show the back of the case; Silver dial STBL-005B (S.S.) China mechanical movement, 17 jewels; China zuzhuang Black leather strap, 200 mm long x 22 mm wide; Buckle buckle Crystal; Push/pull the crown; Fixed stainless steel bezel; 30 meters waterproof: suitable for leisure surfing, swimming, snorkeling, sailing and water sports. Not suitable for diving. This watch has a mechanical movement. A mechanical watch that does not need batteries, but can only be wound manually. To gain the upper hand, please turn the crown clockwise to be in the normal operation position until you feel resistance. This type of watch should be tempered every day.