SAN FRANCISCO (AP) — Fitbit Inc. on Monday reported better-than-expected earnings, but its shares took a hit in after-market trading after the wearable device maker issued a weak outlook for the year.

The San Francisco company said it earned fourth-quarter net income of $64.2 million, or 26 cents per share. Earnings, adjusted for one-time gains and costs, were 35 cents per share.

The results topped Wall Street expectations. The average estimate of 15 analysts surveyed by Zacks Investment Research was for earnings of 25 cents per share.

Fitbit posted revenue of $711.6 million in the period, also topping Street forecasts. Eight analysts surveyed by Zacks expected $645 million. A year earlier Fitbit earned $39.2 million, or 19 cents per share, on revenue of $370.2 million.

As of Dec. 31, active users more than doubled to 16.9 million year over year, while registered device users also surged, to 29 million.

For the year, the company reported profit of $175.7 million, or 75 cents per share. Revenue was reported as $1.9 million.

Looking ahead, for the current quarter ending in April, Fitbit said it expects revenue in the range of $420 million to $440 million. Analysts surveyed by FactSet forecast $483.8 million, on average. Fitbit said it will launch products worldwide during the first quarter, which may drive higher its sales and marketing and manufacturing expenses.

The company expects full-year earnings in the range of $1.08 to $1.20 per share, with revenue ranging from $2.4 billion to $2.5 billion. That compares with the average estimate for earnings per share of $1.14 on revenue of $2.41 billion.

Fitbit shares have dropped 44 percent since the beginning of the year. In after-hours trading, the stock declined more than 14 percent to $14.10.

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Elements of this story were generated by Automated Insights (https://automatedinsights.com/ap) using data from Zacks Investment Research. Access a Zacks stock report on FIT at https://www.zacks.com/ap/FIT