The Baco L21AA04-3E10 is a 22 mm yellow flush-mount momentary pushbutton with a chrome bezel and a 3-position clip. It features 1 normally open (NO) contact for clear on/off signaling, with high-visibility yellow illumination for warning or special-operation cues. Its flush design delivers a sleek, vandal-resistant profile that fits neatly into standard control panels, making it ideal for panel installations, process equipment, and automation dashboards.