To find the energy hogs, you simply plug each appliance into the meter in turn, and then plug the meter into the wall socket and leave it switched on for a fixed time.
My husband and I wasted gas driving around after the storm, trying to find a place with an open electric socket where I could plugin my dead laptop to finish a deadline project.
The box will still ship with a micro-USB to USB cable in the box, allowing the handset to plug into a deskbound computer or a mains charger with a USB socket.