Minute repeater watches are the most complicated watches to make for a watchmaker. They are made by the best craftsmen and require hundreds of hours of work. Only hand work can make such watches.
Minute repeater watches ring whenever you activate the pusher. The most complicated ones can ring hours, quarters and minutes. They are recognizable by the push-button often placed on the left side of the case.
They made it possible not to see but to hear the time. Useful in the dark or to avoid offending your guests by looking at your watch!