The GST301 conventional gas extinguishing control panel is packed with unique features that you have come to expect from a GST product that have enabled us to become world recognized as a leading manufacturer in the fire detection industry. The system provides 3 fire detection zones, two of which are utilized for double knock gas extinguishing control, and a third Auxiliary fire detection zone for additional areas out side of the gas protected area. This Zone will operate as a normal fire detection zone and have no interaction with the gas release system. Primary and Standby cylinder key switch, that enables quick and easy transfer to the reserve cylinders, thus to ensure that the area can be left protected after an evacuation. The pre release gas countdown timer display on the panel to shows the amount of time left (in seconds) before the gas will be released, this is adjustable from 0- to 90 seconds, (all panels are sent factory set at 30 seconds delay).