Seiko Prospex collection:
Seiko Prospex: a lively story in which even the wildest expectations of athletes and adventurers are exceeded. Unique diver watches, dynamic pilot watches and specimens with rotating compass ring. No wish remains unanswered. Clocks with professional specifications to discover the world your way. On land, at sea and in the air. Experience Seiko technology.
A mechanical watch automatically recharges itself when worn by converting the wearer's arm and wrist movements into energy. Movement of the watch causes the main spring of the watch to excite. This spring is the source of energy.