This "device" is really just networked air, which has been filled with signals and can recognize a person and access their individualized information based on their dna. The networked air provides a visual experience for the user, and allows them to see what is going on in their community, whether it is events, or information on agriculture (shown below), disaster prediction information, location of certain tools and resources which are available to you, or other information.
The Energy Footprint is a way to make the community competitive and encourage participation in the betterment of one's community. It is a public measure of how much you have contributed, whether it is food production, solar power production, or labor improving digital maps the community uses to find information, and how much you have used, whether it is extensive car rides, or heat usage, etc. There is no penalty for the lowest ranked person, and no reward for the best ranked person, but rather it is a way to encourage intrinsic motivation of the community, much like the measure for steps walked on the iphone's fit bit, which people use for healthy competition today.