Emergency/Normal Call In Switch used with the V-2924A, Expandable Talkback Intercom System and provides quick connection to a designated station. Emergency button transposes a single press of the button into four required closures to generate an emergency class or service call.- Easy Access Call Button.- Fits Single Gang Electrical Box.- Stainless Steel Faceplate.- Use W/ Talkback Speakers For Remote Call In.- Interior Use Only.- Normal Button Gives One Momentary Closure Per A Single Press.