Network connection: Link up to 12 units together so when smoke triggers one room, alarms sound throughout larger homes or commercial premises Optical detection: The photoelectric sensor identifies smoke particles early and operates reliably throughout its 10-year lifespan Mains-wired installation: Equipped with a replaceable 5-year 9V backup battery to maintain continuous protection Status monitoring: An integrated test button enables quick routine checks, while the low-battery indicator signals when the backup cell requires replacement Certified standards: Meets BS 14604 and NEN2555 requirements; package includes the FSM-17300 smoke alarm, 9V battery, and instruction manual
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