From Misfit Shine and the Pros and Cons of Wearable Fitness Trackers:

The Misfit Shine is about the size of two U.S. quarters placed back-to-back.
The Misfit Shine is about the size of two U.S. quarters placed back-to-back.

The Misfit Shine is about the size of two U.S. quarters placed back-to-back. Image courtesy of Misfit Wearables.