Leaving devices and chargers connected to the power supply without using them generates what is known as "phantom energy consumption", as many appliances continue to consume electricity even when they are turned off or in standby mode, such as televisions, computers, microwaves or chargers plugged in without being in use. Although the cost of each one is small, when accumulated among several devices connected throughout the day it can become significant, reaching to represent between 5% and 16% of the total household electricity consumption. This implies an inefficient use of energy and a greater environmental impact.