Ukuvalwa kweswitshi eludongeni kulula ukuyifaka kunye nokusebenza ngodonga oluninzi - iiswitshi ezixhonyiweyo.Zinesiseko esibomvu sokubonakala okuphezulu kunye nesigqubuthelo esicacileyo esithintela ukutshintshwa kweendonga ukuba zifakwe kwaye zitshixe kwindawo ethi "on" okanye "off".