The Green Stopper Station 3-Pack from STI three complete buttons. Each button has a protective shield, three activation choices and three snap-in message choices. Also offers less waste with minimal cardboard and paper used for packaging. Each button functions as a momentary button but can be changed on site to Key-to-Reset or Turn-to-Reset. LED illumination (red, green, white) allows users to easily find the push button in a dark corridor.