Wireless APP ControlDigital Indoor Hygrometer, Temperature Sensor uploads data to APP when connecting via Bluetooth. You can check the max and min values of temperature and humidity on APP from your phone. Support 35m distance between phone and transmitter without obstacles.Data Storage ExportThermometer hygrometer support temperature data export function, record one group of data every 10 minutes, can store up to 100 days of data. A smart device can be connected to up to 100 temperature sensors simultaneously. Available to export data in CSV format for free after registering an account.Precision SensorDigital thermometer, Accurate and sensitive built-in temperature and humidity sensor, it refreshes once per second to provide more data precise and faster. Temperature error can within 0.5 (1), humidity error can within 5%. Adopted Bluetooth 5.0 chip, the temperature sensor provides real-time wireless monitoring of temperature(-20-60)/-4-140and humidity(0-100RH).Smart Alert ReminderThe temperature sensor uploads data to APP when connecting via Bluetooth. You can check the maximum and minimum temperature and humidity values on APP. The sensor with the sound alert on the device, if the temperature or humidity is out of range, it will have the alert on the device. The alert notification will also be sent to your phone. Mini and Portable Design Indoor Outdoor Thermometer, The wireless humidity sensor is smaller than others. Measures 1.79 x 1.79 x 0.47 inches; There is a magnet on the back, which can be attracted to magnetic objects. Space-saving and handy. Easy to install. It can be applied in home monitoring, pets, refrigerators, freezers, walk-in coolers, wine cellars and greenhouses, etc.