Fitbit unveiled its Q4 2015 numbers along with numbers for the whole 2015. The fitness device maker reported Q4 revenue of $711.6 million, with adjusted EBITDA of $125.3 million. For the full-year 2015, the company reported revenue of $1.86 billion, and adjusted EBITDA of $389.9 million.

“We believe we are beginning 2016 with strong customer engagement and retention, an accelerating pace of innovation and competitive differentiation, and a foundation of significant revenue growth and profitability in 2015,” James Park, Fitbit co-founder and CEO, said in a statement. “I am very optimistic about our growth opportunities and long-term vision as a broader digital health company.”

The fourth quarter of last year was the most successful for Fitbit as it managed to move 8.2 million health and fitness devices — for the full year it moved 21.4 million devices. During the period, its revenues increased 92 percent year-over-year, while adjusted EBITDA increased 66 percent.

U.S. comprised 75% of Q4 revenue, followed by EMEA (12%), APAC (8%), and Other Americas (5%). Revenues in the U.S. were up 100% year-over-year, in EMEA – 191%, in APAC – 6%, and in Other Americas – 77%.

Newer products such as Fitbit Charge, Fitbit Charge HR and Fitbit Surge, comprised 79% of revenue in the period.

With 149 percent increase in revenue and 104 percent increased EBITDA, the full-year numbers are equally impressive.

Newer products such as Fitbit Charge, Fitbit Charge HR and Fitbit Surge, comprised 79% of revenue in Q4 2015.For the whole year 2015, U.S. comprised 74% of revenue, EMEA – 11%, APAC – 10%, and Other Americas – 5%. U.S. revenue grew 146% year-over-year, EMEA – 244%, APAC – 110%, and Other Americas – 139%.

At the end of last year, Fitbit had 16.9 million active users, up from 6.7 million in the same period of 2014. Meanwhile, total year-end 2015 registered device users was 29 million.

In addition, Fitbit mentioned new products it unveiled recently, including the Fitbit Blaze and Fitbit Alta, both of which have exceeded internal pre-order forecasts. The company also bragged about the fact that it added 1,000 new Wellness enterprise customers in 2015.

R&D headcount grew to 624 at year-end 2015, comprising 57% of the company’s employees.

For the full-year 2016, Fitbit expects revenue in the range of $2.4 to $2.5 billion, driven by new product introductions and geographic expansion, with gross margins ranging from 48.5% to 49.0%, and adjusted EBITDA ranging from $400 to $480 million.

For the current quarter, the company forecasts $420 to $440 million in revenue, and that apparently wasn’t good enough for investors; in after-hours trading, Fitbit’s stock was down 16 percent.