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%. Features a Bluetooth 5.0 chip for real-time wireless monitoring of temperature (-20°C to 60°C) and humidity (0-100% RH). Upgraded connection range up to 50 meters (164 feet) in open area.Wireless APP Control - Temperature sensor uploads data to the app via Bluetooth. View maximum and minimum temperature and humidity values on the app. One 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, alerting you to changes in temperature or humidity. Suitable for monitoring homes, pets, refrigerators, freezers, walk-in coolers, wine cellars, and greenhouses.Data Storage and Export - The wireless thermometer hygrometer records data every 10 seconds in the app, storing up to 100 days of data (ensure your phone is within range at least once per day). Data can be exported in CSV format for free after account registration.Mini Portable Design - Compact size (1.5 x 1.5 x 0.62 inches), powered by a built-in CR2477 battery (approximately 1.3 ounces). Battery life lasts up to 10 months. Includes a hanging hole for flexible placement. Space-saving and portable. if you have any questions or concerns—our customer support team is ready to assist.