One third or more of energy used on a PC & monitor is wasted energy! This wasted energy can cost around £50 or more a year. The ecobutton is an illuminating USB (Universal Serial Bus) device that acts as a reminder for the user to press everytime the computer is going to be left idle. When pressed the computer goes into ecomode & operates more efficiently whilst not in use. 2 minutes, 2 hours, 2 days one small click one BIG change