Washable Pre-Filter Catches Large Particles and Pollutants Twin Electrostatic Precipitators (ESP) Removes Dust, Pollen, Smoke and Any Particles Negative Ion Generator Outputs 3 Million/CC to Neutralize Floating Dust.Suitable for Bedroom, Office, Club and Hotel. Remote Control With 1, 2, 4 and 8 Hours Timer. Two Fan Speed for Dust Collection Power.Wall-Mounted or Desktop Us.Automatic Shut Off When Side Covers Opened Air Pump;Outputs Ozone Via Diffuser Stone And Silicon Rubber Tube for Purification purposes