High Accuracy Sensor - Built-in upgraded MEMS sensor refreshes once per second to provide timely and accurate data. Temperature accuracy within 0.5C, humidity accuracy within 5%. Equipped with Bluetooth 5.0 chip, the temperature and humidity sensor enables real-time wireless monitoring for temperature (-20C to 60C) and humidity (0% to 100% RH). Offers an extended connection distance of up to 50 meters (164 feet) in open areas.Wireless APP Control - The temperature sensor transmits data to the app via Bluetooth connection. View maximum and minimum temperature and humidity values on the app. A single smart device can connect up to 100 sensors simultaneously. Compatible with Android 4.3 and above, iPhone 4s and above.Smart Alert Function - The app displays data in red and sends a notification to your mobile device when readings exceed preset thresholds, allowing timely awareness of environmental changes. Suitable for monitoring home environments, pets, refrigerators, freezers, cold rooms, 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 data (ensure the phone is within range at least once daily). Data can be exported in CSV format at no cost after account registration.Compact and Portable Design - This wireless temperature and humidity sensor features a compact 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 conditions. Includes a hanging hole for flexible placement. Space-saving and convenient for various applications.