Jawbone intros the Up24, its first wireless fitness tracker
 

It took Jawbone two tries to release a fitness tracker that didn't break after several days of use. And it took the company three generations to release one that could sync users' sleep and activity data without having to be plugged in. Today, about two years after the first Up band went on sale, ...

http://www.engadget.com/2013/11/13/j...=rss_truncated