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Band material:genuine leather Case material: stainless steel Movement: Automatic,self-wind Case diameter: Approx. 4.5 cm Band length: Approx. 25 cm Band width: Approx. 2.0 cm Band color: Black Weight: 150g This timepiece is an automatic self wind watch. It is powered up by your wrist and arm movements and needs to be worn fairly consistently in order to work without interruption. So, if you are sitting on a desk for too long, or leave the timepiece on a dresser, overnight, it will require you to rotate your arm or shake it to restart working. This watch is only water resistant for daily usage. One or two drops of water won't do harm to it, but if you wear it into shower or swimming, it will be damaged.