The model PB is a spring loaded momentary, 1 1/2" Diameter, exit button, with bi-color illumination, mounted on a stainless steel single gang outlet box cover. The model PBA is alternate action (push-on; push off). The NO and NC (DPST) contacts switch when the button is depressed and return when it is released. The contacts are UL listed with 7 AMP capacity. The indicator LED and the switch LED can be individually operated according to the needs of the installation. The indicator LED is mounted above the button and the switch LED illuminates the button itself. The PB can be used for momentary release of fail safe or fail secure electric locks. If interfaced with a release hold timer, it can provide for timed release of electric locks. It may also be used to input a REX (request to exit) signal to a card reader system. We recommend that the local building or fire safety authority be consulted prior to using exit buttons for door egress. They may require a "no special knowledge" exit device such as Securitron's Touc Sense Bar.