Item Type: LED Watch Product Material: Stainless Steel, Glass Product Model: 8019 Dial Thickness: Large: Approx. 1.4cm / 0.6in, Small: Approx. 1.3cm / 0.5in (there is Error in Manual Measurement, Error Range: 2mm) Watch Band Width: Large: Approx. 2.4cm / 0.9in, Small: Approx. 2cm / 0.8in (there is Error in Manual Measurement, Error Range: 2mm) Waterproof: 30m Life Waterproof Battery Type: Button Battery (shipped with Built in Battery) Battery Model: Cr1616 Battery Capacity: 50mah Package List 1 x LED Watch 1Wear Resistant: With glass mirror surfaces, the watch has good light transmittance, wear resistant and anti drop. 2Convex Arc Structure: The whole is a convex arc structure, with a strong sense of three dimensional wearing. 3Waterproof: The watch has been tested for vacuum and water resistance, and you don't have to take it off when you wash your hands, wash your car, and get in the rain. 4Binary Time Mode Display: It adopts the personalized binary time mode display, which is exquisite, unique and fashionable. 5Easy To Wear: The watch has a double open stainless steel buckle, which is more convenient and firm to wear.