The system here monitors temperature, humidity, and smoke levels and alerts you if those levels reach a certain point.

Monitor temperature, humidity, and air pressure in every room with the Aqara Temperature Sensor. Optimize comfort, prevent damage, and automate your HomeKit smart home.

Note: Aqara provided MacRumors with a Wireless Remote Switch H1, Smart Wall Switch H1, Temperature and Humidity Sensor, and ‌M2‌ Hub for the purpose of this review.