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Quick verdict
A Z-Wave audio sensor that listens for your existing UL-listed smoke/CO alarms' T3/T4 patterns and relays them to Home Assistant, no need to replace working detectors. It transmits the alarm signal over Z-Wave to Z-Wave JS entirely on the local mesh with no cloud. Just note: Listens to existing alarms rather than detecting smoke itself.
Standout: A Z-Wave audio sensor that listens for your existing UL-listed smoke/CO alarms' T3/T4 patterns and relays them to Home Assistant - no detector swap needed.
Notes last checked Jun 2, 2026.
Compatibility snapshot
Home AssistantexcellentFull local control, no cloud needed. Native Home Assistant integration or a local protocol.
Apple HomenoneNo official support on this platform.
Google HomenoneNo official support on this platform.
AlexanoneNo official support on this platform.
Works offlineyes
Setupintermediate
Extra hub neededyes
Powerbattery
Local control facts
Home Assistant: zwave_js integration, Local Push (home-assistant.io, checked Sep 10, 2026)
Z-Wave JS: in the device database, listed as Ecolink FF-ZWAVE5-ECO (Ecolink Z-Wave Plus FireFighter) (github.com, checked Sep 10, 2026)
Why it stands out
Makes existing dumb smoke/CO alarms smart and local over Z-Wave
Detects both smoke (T3) and CO (T4) alarm patterns
Cheap, ~5-year battery, works with any Z-Wave JS controller
Reasons to hesitate
Listens to existing alarms rather than detecting smoke itself
Must be mounted within ~6 in of the host alarm
Requires a Z-Wave controller
Best for
Homes with existing interconnected smoke/CO alarms wanting local HA alerts
Avoid if
you don't want to run a Z-Wave controller
Privacy and local-control notes
It transmits the alarm signal over Z-Wave to Z-Wave JS entirely on the local mesh with no cloud.
Home Assistant support: supported · integration path: Z-Wave JS.
Buying reality check
Price notes: $39.99 on Amazon (buy box verified 2026-09-02). Still among the more affordable ways to make an existing smoke/CO alarm report to Home Assistant, since it costs less than replacing the alarm itself.
Verified price reads: lowest seen $39.99, latest $39.99 on Sep 8, 2026.
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