From Misfit Wearables Puts Design First in New Activity Tracker:

The Shine wearable fitness tracker, from Misfit Wearables, is about the size of a quarter.
The Shine wearable fitness tracker, from Misfit Wearables, is about the size of a quarter.

The Shine wearable fitness tracker, from Misfit Wearables, is about the size of a quarter. Image courtesy of Misfit Wearables.