Despite slower than expected sales last year, smartwatch sales will grow at a healthy rate and will have the highest revenue potential of all wearables through 2019, according to Gartner.

The market research firm expects global smartwatch sales to reach $11.5 billion in 2016, then jump to $17.5 billion in 2019.

On Tuesday, Gartner said about 30 million smartwatches were sold globally in 2015, and that number is expected to reach 50 million in 2016, then nearly 67 million in 2017. Skipping to 2019, Gartner projects 79 million smartwatches will be sold. Gartner’s 2015 number of 30 million smartwatches sold was down from a forecast of 40 million it made last October.

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