Omron Yellow Square Push Button Lens for Use with A3D Series

Cylindrical push-button switches and indicators for panel mounting
SPST normally open switch units with LED illumination
Indicator only units with LED illumination

Switch & indicator lenses are not interchangeable
Indicator units and switch body's typically require a lens for completion, for lenses see typically stock no's 3664225 (indicator) and 3663991 (switch)