Ecolink FireFighter FF-ZWAVE5-ECO

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.

Last checked: 2026-06-02

Compatibility snapshot

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: Around $35. Among the more affordable options in this category.

Compare side by side: see smoke alarm comparisons →