Alarm Controls Request to Exit Stations 
Alarm Controls Corp. Alarm Controls TS-27B Black 1.5'' Diameter Mushroom Button TS-27B

same as ts-27 except black mushroom button

Black 1.5" Diameter Mushroom Button

Normally Opened & Normally Closed Contacts

Labeled "Push to Exit"

Momentary Action Switch w/ Screw Terminals

1.75" Narrow Stainless Plate Wallplate