Movement: Automatic movement Dial Window Material Type:Sapphire CrystalWater Resistance Depth:30m Dial diameter: about 40mm Dial thickness: about 11mm,Remove The Mirror Only Thin 6.5MM Band width: about 20mm Case Material:Stainless steel Band Material:Stainless steel Band Color:BlackBand Length:Approx 20cm Clasp type: Push Button hidden Clasp Why you choose this watch? 1: 30 days money back guarantee for any reason 2: 12 monthes replacement or full refund for quality issues 3: 7x24hours service time 4: Attractive gift packing, very good gift for someone or the business gift 5:Free remover tool include so you can adjust the link's length as you like. 6: Free Fast and tracked shipping which only takes 7-18days to arrival if send by seller. We are professional watch sellers, selling any kinds of watches for men/women. If you need any hlep about watches, a good choice to contact us. Purchasing watches form us is not only just a watch, but with good customer service and warranty. ·If you are satisfied with our products and service, please give us a positive feedback; ·If not，before you leave us negative feedback, please contact us first. We will work with you to solve the problem. ·Thank you for your attention! Have a good day!