Meross Smart Temperature and Humidity Sensor (Hub Required) Works with Apple HomeKit, Amazon Alexa, Google Assistant, and SmartThings. Battery Replacement-Free for Life: Ambient microlight collection, enabling a lifetime of battery-free replacement. Remote Monitoring: Monitor environmental temperature and humidity changes anytime, anywhere (with internet connectivity). Precision Detection: Built-in 4th generation Swiss-made high-precision sensor. Multi-Scenes: Monitor temperature and humidity via the Meross app anywhere anytime, such as the baby’s room, refrigerators, basement, etc. Real-time Alert Notifications: Receive instant notifications through our dedicated app when the temperature and humidity levels surpass your predefined thresholds. Devices Automation: Set temperature and humidity conditions to trigger Meross device automation, such as the on/off of plugs, lights, and switches. 2-Year Data Storage & Export: View and export temperature and humidity data for the past 2 years using the Meross app.