GCZ AP304 air purifier can refresh the air in rooms up to 1400 sq. ft, with a CADR of 187 CFM. It's the air purifier perfect for living room, bedroom and kitchen. Connecting home WiFi(not 5G) to open a smart healthy living, you can use APP to control it wherever you are. This air purifier is also voice controlled, you can operate with Alexa or Google Assistant. 4-stage filtration H13 True HEPA filter, can capture and reduce up to 99.97% of particles as small as 0.3 microns in the air, including dust, pet dander, hair, pollen, cigarette smoke, odors, oil fume, VOC, and more. Get great relief from asthma, pet allergies, coughs, sinusitis, sneezing, and chronic allergies. To find official replacement filters on Walmart, please click here!