The Levoit PlasmaPro® 400S-P Smart Air Purifier refreshes the air in an area up to 1,755 ft² (1 ACH) with noise levels as low as 22dB. The device filters at least 99.97% of airborne particles down to 0.3 microns and removes VOCs, odors, fumes, and smoke with 3-stage filtration. The laser dust sensor scans the surrounding air for airborne particles and displays the amount detected on the PM2.5 display. With smart controls on the VeSync app, you can control air purifier settings no matter where you are, connect to third-party voice assistants, and receive real-time notifications about air quality and filter life.