Fitbit reported sales of $409.3 million for the third quarter, which was more than double the turnover of $152.9 million reached in the same quarter last year. The U.S. maker of connected health and fitness products said it sold 4.8 million devices during the quarter, but its net income shrank by 33.5 percent to $45.8 million due to growing costs. About 66 percent of Fitbit's sales came from the U.S. market, compared with 16 percent in Asia-Pacific, 12 percent in Europe, the Middle East and Africa, and 6 percent in the rest of the Americas. EMEA sales nearly trebled compared with the same quarter last year. The company has been enhancing its products for other regions, for instance by integrating Baidu maps in China. Fitbit's guidance predicts that sales should reach between $1.77 and $1.8 billion for the full year. The company, which went public in June, went on to announce a follow-on stock offering.