[Wireless App Control]We uses a high-end Bluetooth 5.0 chip and can easily monitor temperature and humidity data on app via Bluetooth. (Free downloading from and ) [Data Storage Export]Support temperature data export function, record a group of data every 10 seconds, can store up to 100 days of data. Data on the APP shows red when data is beyond preset range. [Higher Accurate Monitor]Using an accurate and sensitive Sensirion temperature and humidity sensor, it can achieve a temperature error of ± 0.5 ° C (± 1 ° F), a humidity error of ± 3%, and refresh once per second for higher accuracy. [Portable Design]Wireless sensors Smaller size than other (1.5 x 1.5 x 0.62 inches). Space-saving and portable. It can be used for about 1 year withCR2477 battery. [Bluetooth distance range]This product supports a barrier-free distance of 50 meters between the mobile phone and the transmitter