- With its 4 speed settings and intuitive LED touch controls, the air purifier is a breeze to operate - 3-stage filtration keeps pollen, dust particles, pet dander and other pollutants at bay- You can monitor the quality of your air just by glancing at the nifty light indicators  - Night mode dims the lights and runs the purifier in quiet mode, so you can enjoy a peaceful night's sleep- The handy timer turns it off automatically - you can choose between 2, 4, 6 or 8 hours