Jawbone's UP24 ($150) is the original UP, which was released, recalled, and then rereleased within the past two years. This edition looks very much like what we've seen before, placing activity tracking sensors into a permanently curved rubber band. Now though, UP24 wirelessly communicates data back to a supported Bluetooth 4.0 device, rather than requiring a physical connection. That was one of our primary concerns with the original edition, so we'll…
