First Alert 3120B vs Roost Smart Battery

  • Great for eliminating the need to pinpoint alarms
  • Low battery chirp is a desirable feature
  • AA batteries used instead of 9V types for power backup
  • Silencing for the alarm and the low battery chirp
  • Some units stopped working after a few months
  • Great for people who have smoke detectors
  • Battery lasts for a few months
  • App is not very confidence inspiring
  • Quality control is lacking
  • Died after two uses

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