Air Purifier Bedroom Office Use True Hepa Filter -Silent

True hepa filters - techcare air purifier has advanced 3-stage filtration with high-efficiency particulate air (true hepa) filters, which are proven to trap 99.97 percent of particles of 0.3 microns in size. silent comfort - air purifiers have special silent comfort, white noise feature to make it work under 28 db with white noise for the office or bedroom use. sleep mode is even makes it more silence and focusing on the white noise. california compliant - our product designed and distributed in california, it is arb certified and comply with federal ozone emissions limits. it is 100% ozone emission free. smart air purifier - filter indicator will let you know when the filter needed to be replaced.