Items marked by the "4000CSI" tag:

4000CSI Internal Controller equipped with a Sensor and encased in a Solid Cover, specifically designed for the AirROS purification system. 

This unit effectively functions as the central processing unit of the AirROS purifier, with an embedded sensor adept at detecting levels of Reactive Oxygen Species and managing the purifier's operation to maintain optimal efficiency. 

The solid cover encloses the electronic components, offering robust protection against environmental aggressors like dust and moisture, thus preventing potential damage to the device’s sensitive internal elements.