The C-9318 Gas Extinguishing Warning Indicator provides visual warning that a gas extinguishing system has been activated. It features a red LED that lights continuously after gas is released from the compatible GST gas extinguishing control panel. Installed at entrances, it alerts people not to enter the protected area with the message "Gas Extinguishing DO NOT ENTER". Powered by 24VDC, it connects in series with other indicators or a resistor for non-addressable operation with a gas extinguishing control system.