From the master artisans at Seiko, the Seiko Guys's SNK807 Seiko 5 Automatic Blue Canvas Strap Watch is an innovative timepiece with a manly appeal. Including a blue analog dial and a blue canvas band, this watch is packed with style and would be a great addition to your watch collection.This is an automatic mechanical watch. Automatic watches do not run on batteries; instead, they are powered automatically by the motion of the wearer's arm. If the main spring in your automated watch is not wound adequately, timekeeping may become less accurate. In order to maintain accuracy, wear the watch for 8 hours or more daily, or by hand wind the main spring by turning the crown. When not in usage, automated watches may be kept accuseded of an automatic watch winder-- a watch storage unit which may be bought separately.