Indoor Digital Hygrometer Wireless APP Control, 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 Export The wireless thermometer hygrometer will record data every 10 minutes, which is total up to 100 days. Available to download data in CSV format. A smart device (such as your phone) can be connected to up to 100 temperature sensors simultaneously. Smart Alert for Reminder The temperature sensor uploads data to the app when connecting via Bluetooth. You can check the maximum and minimum values of temperature and humidity on APP. The sensor with the sound alert on the device, if the temperature or humidity is out of door, it will have the alert on the device. The alert notification will also be sent to your phone. Precision Sensor Digital thermometer, built-in temperature and humidity sensor, precise and sensitive, it refreshes once per second to provide more accurate data and faster. The temperature error can 0.5 (1), the humidity error can 5%. Adopted Bluetooth 5.0 chip, the temperature sensor provides real-time wireless monitoring of temperature (-20-60) / - 4-140 and humidity (0-100 RH). Design mini and portable indoor thermometer, The wireless humidity sensor is smaller than the 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 surveillance, pets, wine cellars and greenhouses, etc.