Wireless APP ControlDigital indoor hygrometer and temperature sensor upload data to APP when connected via Bluetooth. You can check the maximum and minimum temperature and humidity values on the mobile APP. Support mobile phone and transmitter 35m distance without obstacle. Data storage and exportThe temperature and humidity meter supports 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 SensorDigital thermometer, accurate and sensitive built-in temperature and humidity sensor, updated every second, providing more accurate and faster data. Temperature error is 0.5C (1F) and humidity error is 5%. Using Bluetooth 5.0 chip, the temperature sensor wirelessly monitors temperature (-20-60)/(-4-140) and humidity (0-100% RH) in real time. < p> Smart reminderUpload data to 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 audible alarm that will trigger an alarm on the device if the temperature or humidity is out of range. Alert notifications will also be sent to your phone. Portable mini design Indoor and outdoor thermometer, the wireless humidity sensor is smaller than other sensors . The dimensions are 1.79 x 1.79 x 0.47 inches; there are magnets on the back to hold magnetic items. Space saving, convenient and easy to install. It can be used in home monitoring, pets, refrigerators, freezers, walk-in freezers, wine cellars and greenhouses, etc.