High Accuracy Sensor: Built-in MEMS sensor refreshes once per second to provide accurate and fast data. Temperature error within 0.5°C, humidity error within 5%. Equipped with Bluetooth 5.0 chip, the sensor enables real-time wireless monitoring of temperature (-20°C to 60°C) and humidity (0-99% RH). APP Control Without Wire: The temperature sensor transmits data to the APP via Bluetooth connection. View maximum and minimum temperature and humidity values on the APP from your smartphone. Compatible with Android 4.3 or above, and iOS devices. Temperature and humidity can also be viewed on the 1.5-inch screen. Download the APP from App Store or Google Play. Smart Alert for Reminder: When readings exceed preset levels, the APP displays alerts in red to notify users of changes in temperature and humidity. Notifications are sent directly to the APP. Suitable for use in homes, pet environments, refrigerators, freezers, walk-in coolers, wine cellars, and greenhouses. Data Storage and Export: The wireless thermometer hygrometer records data every 10 minutes, storing up to 100 days of information in the APP. Data can be exported in CSV format after account registration. Design Mini & Portable: Compact and lightweight design. Powered by CR2477 battery with approximately one year of battery life. Replaceable battery. Includes a hanging hole for flexible placement. Button located on the back of the sensor.