Gateway and 3PC Smoke Alarms

4-piece kit – 1 gateway + 3 smoke alarms for full-home coverage 10-year non-replaceable battery – maintenance-free long-term use Free Wisualarm App control – real-time alerts, remote test/locate alarm source Wireless interconnection – one alarm triggers all, synchronized 85dB alerts Human voice broadcasting – clear alerts for easy hazard identification Multi-user sharing – up to 6 accounts can access via app Expandable to 24 devices – build a complete smart safety network