Like open fire, it is not necessary to get up to turn off anymore, but how good would come with consequences. If the body does not work at all, it will make the body of the people, we as parents have paralysis.
Such time - turn off the light, you do not need to get up and go off again. But good will always come with a bad result. If the body is not in use yet. It makes our bodies be paralyzed.
Such as the open - off, it is unnecessary to stand up to close again. But the good comes with sound effects. If the human body is not in use. It will make the human body's paralysis.