The A420-066644-00 is a type of illuminated switch manufactured by Guardian Electric. This switch is slightly larger than a standard switch, and it has an illuminated button with a clear lens that allows the user to easily locate the switch in dark or dimly lit areas. The switch also has a snap-in mounting feature for easy installation and a moisture-resistant design for long-term performance in damp environments. This switch is rated for 20 amps and is UL, CSA and NOM certified, making it suitable for a wide range of indoor and outdoor applications.