Hello!Welcome to our store Description: Special functions: world time, luminous, week display, alarm, lighting, chronograph, month display, calendar, 24-hour indication Waterproof performance: life waterproof Buckle material: stainless steel Movement type: electronic Strap material: TPU Mirror material: plexiglass mirror Display type: number Style: sports Package include:1Pcs Color :Black/Blue/Green/White Size:Diameter 50mm Material:Resin There are 2-3% difference according to manual measurement. please check the measurement chart carefully before you buy the item. 1cm=0.39 inch,1 inch=2.54 cm
