Timermall Internationale FC Fabric Velcro Strap Analogue Sport Watch Ohsen Brane Sports Watches, Case Thickness 14mm/0.55", Case Height(Dialmeter) 60mm/2.36", Band Belt Strap Width 25mm/0.98", Length Mens Standard Precision Japanese Quartz Movement Made by Seiko Instruments Inc Keep Time Accurate.Waterproof for washing hands, shower or swimming For Birthday, Christmas, New Year Gift ,Greaduation, engagement, also a great present for good Friends, Baby and business gifting. Come with EXTRA 1 PC Backup Battery For replacing The One Battery Installed Inside IF It's Run Out While Arrival or Subsequent Use. There had a battery installed. Remove the wihte clip at the crown and turn the hands to the right time, push the crown in , the watch would begin to work. If the inside battery had run out unfortunately, you can screw out the back case cover with a "+" screw driver for replacing the battery.