【Wireless APP Control】 The digital indoor hygrometer and temperature sensor uploads data to the APP when connected via Bluetooth. You can check the maximum and minimum temperature and humidity values on the mobile app. Supports mobile phone and transmits 35m distance without obstruction. 【Data Storage and Export】 The temperature and humidity meter supports temperature data export function, records one set of data every 10 minutes and can store up to 100 days of data. A smart device can connect up to 100 temperature sensors simultaneously. After creating an account, you can export data in CSV format for free. 【Precision Sensor】 Digital thermometer, accurate and sensitive built-in temperature and humidity sensor, updated every second, providing more accurate and faster data. The temperature error is ±0.5 °C (±1 °F) and the humidity error is ±5%. Using a Bluetooth 5.0 chip, the temperature sensor wirelessly monitors temperature (-20-60 ℃) / (-4-140 ℉) and humidity (0-100% RH) in real time. 【Smart Reminder】 Upload data to the APP when the temperature sensor is connected via Bluetooth. You can check the maximum and minimum temperature and humidity values on the APP. A sensor on the device with an alarm sound that triggers an alarm on the device if the temperature or humidity is out of range. Notification messages are also sent to your phone. 【Portable Mini Design】 Indoor and outdoor thermometer, the wireless humidity sensor is smaller than other sensors. Dimensions are 1.79 x 1.79 x 0.47 inches; there are magnets on the back to hold magnetic objects. Space-saving, convenient and easy to install. It can be used in home monitoring, pets, refrigerators, freezers, cold rooms, wine cellars and greenhouses, etc.