Aqara TVOC Air Quality Monitor - Temperature, humidity and TVOC (Volatile Organic Compound) concentration sensor. E-Ink display. Zigbee 3.0 support - you need an Aqara Hub to connect to your smart home. You can then automate actions - turning on the fan or air conditioner when a certain temperature or TVOC value is exceeded, etc. Statistics in the Aqara Home app. 1 year battery life. Batteries included.