How do I know if my smoke or carbon monoxide detector emits a T3 or T4 alarm pattern?

We always recommend testing the compatibility of your alarm with the alarm detection feature. For more information, visit How do I test my Arlo device with my smoke and carbon monoxide detectors?. The user manual, guide, or other documentation that came with your detector should indicate the alarm pattern. If the accompanying documentation doesn’t indicate the alarm pattern, try searching for product information online.

Newer smoke detectors tend to emit a T3 alarm (three intermittent beeps followed by a period of silence), and carbon monoxide detectors emit a T4 alarm (four intermittent beeps followed by a period of silence).

Some examples of alarm models that emit compatible T3 and T4 signals:

  • Kidde i9050
  • USI5304
  • First Alert 0827
  • First Alert P1210
  • First Alert SCO5

Note: The test button on your smoke or carbon monoxide detector might not emit the T3 or T4 pattern. If it emits a different sound (such as a single beep), you can’t accurately test Alarm Detection.

 

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