Rocker switches turn their connected circuit on or off when pressed. They pivot between two positions, making it easy to identify their set position. Non-illuminated rocker switches don't have any lighting elements and are for situations where light indication is unnecessary or could be distracting. Illuminated rocker switches light up to indicate whether they are powered or activated. Prewired rocker switches have pre-terminated wire leads to help save time when installing or troubleshooting.