1. Negative Ion Positively cleaning particulate pollution. 2.Ozone Function Removes Odor in the area. 3.3 levels of Fan Speed optional, adjust whatever speed you want. 4.4 Layer filter helps clean the air. 5.Filter changing indicator light, smart machine, smart lives. 6. 4 Timing mode, flexible and convenient. 7. Remote Control, you can adjust the machine in a sofa. 8. Filter replacement indicator, guidance of the filter’s status.