Wireless APP Control: Hygrometer thermometer Bluetooth 5.0 will upload data to the APP when connected via Bluetooth. You can check the maximum and minimum temperature and humidity values in the APP from your phone. You can set the monitoring range for temperature and humidity. The value in the app will turn red when it is out of range. The alarm notification will also be sent to your phone. Sensitive and accurate: Indoor thermometer with precise and sensitive temperature and humidity sensor. The temperature error can be ±0.5℃ (±1℉the humidity error can be ±5%. It will update once per second to provide more accurate and faster data. Export Data Storage: The indoor thermometer digital hygrometer will save data to the APP every 10 minutes, which is 100 days in total. Portable Design: Indoor thermometer smaller than others (35 x 35 x 16mm). Space-saving and portable. A hanging hole can be installed in different places as you like. With a CR2477 battery, it can be used for about 200 days.