HATHEPHS Wireless Interconnected Smoke Detector with 10 Year Battery (3 Pack)

https://youtu.be/Ka1kIl-hCHk

Wireless Interconnected Smoke Detector Fire Alarm, HATHEPHS 10 Year Battery Interlinked Smoke Alarm with Enhanced Photoelectric Sensor, Adhesive Tapes Included, 3-Pack (Amazon Affiliate)
US: https://amzn.to/3RahZF0