The SONOFF SNZB-02P is an upgraded Zigbee 3.0 temperature and humidity sensor known for its low power consumption. *Requires a Zigbee Hub Features: The temperature accuracy is within ±0.2°C, while humidity accuracy is within ±2%RH. Data updates every 5 seconds, providing real-time insights into environmental changes. The comfort alert feature allows you to set thresholds, receiving immediate notifications on your phone when the room temperature or humidity exceeds your comfort range, thus aiding in maintaining a comfortable living environment and ensuring quality of life. SNZB-02P supports cloud-based historical records, storing daily temperature and humidity data in the app. Accessing variations for each day, month, or every six months through real-time queries is made easy. Additionally, you can download the data to enhance your living environment based on temperature and humidity trends. Set up smart scenes to control fans and humidifiers based on different temperature humidity levels at night, creating a comfortable sleep environment for you. 4 years battery life Can connect to Google Home or Alexa. Specifications: Model: SNZB-02P Working temperature: -10°C~60°C Wireless connection: Zigbee 3.0 Battery model: CR2477 Casing material: PC Product dimension: 45x45x17.7mm