【High Accuracy & Fast Refresh】 With the Swiss-made smart hygrometer sensor, the temperature is accurate up to ±0.2°C/±0.4°F while the humidity is ±2%RH, data measurements are updated every 5 seconds to give you the lastest changes of temp and humidity. 【Zigbee 3.0 Compatible】Supports Zigbee hubs using the Zigbee 3.0 protocol, like SONOFF iHost, NSPanel Pro, ZB Bridge Pro, and ZBDongle-E. And theoretically supports adding to any Zigbee hub developed in accordance with Zigbee 3.0 protocols, like Echo 4th Gen, SmartThings Hub V3. 【Comfort Alert】When the room temperature or humidity exceeds your set comfort range, you will receive immediate notifications on your phone, helping you maintain room comfort and ensuring life quality. 【Data Storage & Export】Up to half-year free cloud storage, You can easily access the temperature and humidity variations for each day, month, or every six months through real-time queries, and data can be exported. 【4 Years Battery Life】Powered by a CR2477 battery. The battery life data is obtained from SONOFF’s internal laboratory, please refer to the actual use. Please note: SONOFF SNZB-02P temperature and humidity sensor only supports Alexa voice announcements for temperature readings and does not support humidity announcements.