High Precision and Rapid Refresh: Utilizes a Swiss-made smart hygrometer sensor for temperature accuracy up to ±0.2°C/±0.4°F and humidity within ±2%RH. Data measurements refresh every 5 seconds, providing you with the latest changes in temperature and humidity Zigbee 3.0 Compatibility: Supports Zigbee gateways using the Zigbee 2.0 protocol, including SONOFF iHost, NSPanel Pro, ZB Bridge Pro, and ZBDongle-E. Theoretically compatible with any Zigbee 3.0-developed gateway, such as Echo 4th Gen, SmartThings hub V3 Comfort Alerts: Instant notifications on your smartphone when room temperature or humidity exceeds your set comfort range, helping you maintain a comfortable living environment and ensuring quality of life Data Storage and Export: Offers up to six months of free cloud storage. Easily access daily, monthly, or bi-annual temperature and humidity changes through real-time queries and export data as needed 4-Year Battery Life: Powered by a 1000mAh 3V CR2477 battery, with battery life data derived from SONOFF's internal lab testing. Actual usage may vary Specifications: Model: SNZB-02P Wireless connection: Zigbee 3.0 Battery model: CR2477 Casing material: PC Working temperature: -10℃ ~ 60℃ Product dimension: 45 x 45 x 1 7.7mm