Plug the metal end of the extension hose into the inlet in the wall, which turns the suction on instantly. Then plug your current hose into the hose cuff on the other end of the extension hose. Now you can vacuum the farthest to reach corners. Keep in mind if you have an on/off switch on the handle, it will not turn the suction back off. You will need to go back to the wall to unplug the extension hose.