Pop open any watch buying guide or news story (like the brilliant ones on our site) and you’ll be hit with a wall of jargon you’re expected to just… know. Tourbillon, perpetual calendar, minute repeater – it sounds like a foreign language, because in a lot of ways, it is.

A “complication” is watch-speak for any function beyond simply telling the time. Some are genuinely useful, while some are showing off. Most are a bit of both.

Here’s what each watch complication actually does, and why it costs what it costs.

Chronograph

The chronograph is the complication you’ve almost certainly seen before, even if you didn’t know its name. It’s basically a…

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