Sleep soundly without loud rattling coming from your air purifier. This air purifier keeps noise levels as low as 25dB while keeping your space fresh. It's easy to use with just two buttons to cycle through 3 speeds and check the reset filter indicator. The screen indicator automatically turns off one minute after operation. Tired of dragging a bulky purifier? Light, travel-friendly, and compact, the Levoit Core Mini-P Air Purifier (16.5 × 16.5 × 26.4 cm) easily fits in any bedroom, office, or living room, creating less clutter and more fresh air. The Core Mini adopts 360° VortexAir 3.0 technology and a 3-stage filtration, which can purify 17㎡ in 30 minutes. Solve most of your air quality problems, such as pollen, dust, smoke smell, pet dander, etc. It's power saving, rated at only 7W and Energy Star certified. Add a few drops of essential oils to the aroma pad to freshen the air around you and relax. LEVOIT air purifiers are 100% Ozone Free and never use UV-C Light or Anion, which can produce harmful ozone. We recommend replacing the filter every 4-6 months. The adapter is stored in the middle of the filter inside the air purifier. If you have any questions, contact LEVOIT's professional customer service team at support.uk@levoit.com.