High Accuracy Sensor - Built-in upgraded MEMS sensor refreshes once per second to provide timely and accurate data. Temperature accuracy within ±0.5°C, humidity accuracy within ±5%. Equipped with Bluetooth 5.0 chip, the temperature and humidity sensor enables real-time wireless monitoring for temperature (-20°C to 60°C) and humidity (0-100% RH). Offers an extended connection range up to 50 meters (164 feet) in open space. Wireless APP Control - The sensor transmits data to the mobile app via Bluetooth connection. View maximum and minimum temperature and humidity values directly on the app. A single smart device can connect up to 100 sensors simultaneously. Compatible with Android 4.3 and above, iOS 9.0 and above. Smart Alert Function - The app displays data in red and sends push notifications to your smartphone when temperature or humidity levels exceed user-defined thresholds, allowing timely awareness and response. Suitable for monitoring home environments, pets, refrigerators, freezers, walk-in coolers, wine cellars, and greenhouses. Data Storage and Export - The wireless thermometer hygrometer records data every 10 seconds within the app, storing up to 100 days of history (requires phone to be within range at least once daily). After account registration, data can be exported in CSV format at no cost. Compact and Portable Design - The device features a mini size (1.5 x 1.5 x 0.62 inches) and is powered by a built-in CR2477 battery, weighing approximately 1.3 ounces. Battery life lasts up to 10 months under normal usage. Includes a hanging hole for flexible mounting options. Space-saving and convenient for various applications. For any issues regarding the product or service, support is available to assist with resolution.