The purpose of the concept is that you can charge your phone while you eat.
According to Mashable, the Watt a Box comes with "a detachable 6,100mAh Lithium-ion battery, a USB cable for Android phones and an Apple lightning cable for iPhones." The box is assembled in a such manner so that there's an extra compartment for the battery charger where you can still access its two cable ports.
They're producing a limited number of the boxes and giving them out via social media to selected people who are referred by a friend as someone who's phone is always out of charge.
Here's the Watt a Box in action:
This isn't the first time that the fried chicken brand has tried embedding/shoehorning technology into its food containers. They've also put out limited edition versions of their signature bucket with a photo printer as well as a voice recorder. While none of these things are very practical, they do generate a good amount of buzz. Although, judging by the number of dislikes on the video, it's not necessarily good buzz.
Photo via KFC India.