This Firex KF20LL optical mains smoke alarm has a long-life sealed lithium battery backup (replaced the discontinued Kidde 4985). Installation of this optical smoke alarm is simple plus it is interconnectable to up to 23 other Firex or Kidde Slick mains alarms. As with all our mains smoke alarms, it conforms to BS5839 Part 6 Grade D and has a 6-year warranty (including the battery). A single hush and test button is standard and the battery is included.
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