I sew in my basement.. and one of the great things about that is that it's dark down there.. so the last thing I do when I leave it look to see if there is any light.. no light, everything is off.. that's because everything is plugged into surge protectors, when I flip the switches, the lights, machines, iron, tv, radio, anything that can be on, goes off.. If I see any light, I know I have left something on.