The Fitbit is a fitness tracking device that one wears on the wrist. The device measures such physical activity as steps taken, distance travelled, floors climbed, calories burned, and sleep patterns. It is a rechargeable device that wirelessly syncs to your smartphone to display data on the user's physical activity over a certain amount of time.
The accompanying image is from the Internet of Shit Twitter, an account which posts daily satirical content on the Internet of Things. More from the Internet of Shit Twitter can be found here.