Apple (AAPL, $183.73) is expected to release a glut of new products this year. And for the company's sake, it should.

Apple ran into the brick wall of a slowing global smartphone market last year; smartphone shipments have logged five consecutive quarters of year-over-year declines. The trend is clear, and Apple isn't immune. In fact, Apple has more to lose than many of its smartphone competitors because the iPhone is its primary revenue generator. It was a decade of record-breaking iPhone sales that pushed Apple to become a trillion-dollar company in 2018.

Apple responded to slowing demand by increasing the price of its flagship iPhones, leveraging the higher average sale price to buoy revenue, even as iPhone unit sales fell. That helped to plaster over the problem for a while, but in January the company reported that quarterly iPhone revenues had declined a whopping 15% from the previous year.

Clearly Apple must count on other products and services to take up the iPhone revenue slack. So look for 2019 to be a busy one for Apple CEO Tim Cook as his company cranks up the product releases.

Here are 15 new products we expect Apple to announce at various events throughout 2019.

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Apple is increasingly focused on its Services division as a revenue stream. Margins are high, the company can leverage more than 1.4 billion active Apple devices to promote its services, and subscription revenue isn't affected by yearly hardware release schedules.