Am I right in assuming that this smoke detector is already equipped with a wireless module, as the name suggests ("wireless")?
Does this mean that an additional module does not need to be purchased to network several smoke detectors?

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Yes, correct, you can link several together. If one triggers, they all trigger in parallel.
If you want an alarm via text message/email, you would need a separate communication module.

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Question about Pyrexx Smoke detector PX-1C radio

Am I right in assuming that this smoke detector is already equipped with a wireless module, as the name suggests ("wireless")? Does this mean that an additional module does not need to be purchased to network several smoke detectors?