The PSD212 12 Volt optical smoke detector from ESP Fireline is a 12V proffesional EN grade detector which connects to virtually any 12V Intruder alarm system/panel via direct current. Connected in the same way as a PIR or mag contactact, this detector can be hard wired to a dedicated fire zone or any other spare zone on the panel, and eliminates the need for regular expensive battery changes . In the event of smoke detection this unit will contact the panel directly to trigger alarm sounders (Some panels include dedicated sounders for this purpose) to give you the ultimate edge in fire safety in your home or commercial premesis. In the event of a power cut to your alarm pannel this detector will continue to operate using backup battery power supplied gradually from the panel, ensuring your protection at all times. In the event of a fire this alarm will display bi-dircetional indicators to insinuate the direction of the trigger source, allowing you to potentially stop the pr