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The jumping hour complication is a means of displaying the hour, shown through an aperture, which instantly changes every 60 minutes.
The jumping minute complication is a means of displaying minutes, shown through an aperture, which instantly changes every 60 seconds.
The power reserve indicator tells you the time the watch will continue to function. It can either be seen on hand winding or automatic watches.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.