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). Offers an extended connection range 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. One smart device can connect up to 100 sensors simultaneously. Compatible with Android 4.3 and above, iOS 4s and above. Smart Alert Function - When readings exceed user-defined thresholds, the app displays alerts and sends notifications to your mobile device, helping you monitor environmental changes. Suitable for use in homes, pet habitats, 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 daily phone proximity). After account registration, data can be downloaded in CSV format at no cost. Compact Portable Design - This wireless temperature and humidity sensor measures 1.5 x 1.5 x 0.62 inches and weighs approximately 1.3 ounces. Powered by a built-in CR2477 battery with an estimated lifespan of 10 months. Includes a hanging hole for flexible placement. Space-saving and convenient for various environments. For any issues related to the product or service, support is available to assist with resolution.