Case Diameter: 1.57 Inch (=40mm) Thickness: 0.35 Inch (=9mm) Band Width: 0.75 Inch (=19mm) Size: Fit wrist from 6.8-8.5 inch (=17.4-21.6cm) Dial Window Material: Glass Case Material: Stainless steel Band Material: High grade synthetic leather Water resistant: 3 ATM， not suitable for swimming or shower. Movement: Hand-winding Mechanical. Full spring once a day to ensure the travel time required to the next