Every single one of Apple's major products saw unit sales decline
The number of iPhones sold was basically flat (slightly down) from a year ago, Mac unit sales declined 4% year-on-year, and iPad unit sales plunged 25%.
Apple doesn't break out numbers for the Apple Watch, so we don't know how sales of that product fared.
All in all, it's not a very encouraging set of results for Apple, and underscores the need for the company to come out with a new hit.
Here's Apple's chart of December quarter results: