Wireless App Control: Bluetooth 5.0 Hygrometer Thermometer uploads data to APP when connected via Bluetooth. You can check the max and min temperature and humidity values on APP from your phone. You can set the temperature and humidity monitoring range, and the value on the APP will turn red when it is out of range. The alert notification will also be pushed to your phone. Sensitive and Accurate: Indoor Thermometer with accurate and sensitive temperature and humidity sensor. The temperature error can be ±0.5℃ (±1℉), the humidity error can be ±5%. It refreshes once per second to provide more accurate and faster data. Wide Applications: Bluetooth digital hygrometer can be widely applied in monitoring home, office, kitchen, living room, humidor, guitar case, bedroom, wine cellars, greenhouses as well as musical instruments. It can monitor temperature and humidity changes in real time.