Features: Efficient Purification Settings: Active and Passive Dual-Cycle Purification Active Purification: Releases 20 million negative ions to actively and rapidly capture, neutralize, and settle airborne particles, adsorb harmful substances, effectively purify the air, and degrade various pollutants. By simulating negative oxygen ions found in natural environments such as forests, seasides, and waterfalls, releasing them for 30 minutes can increase oxygen content in the air, creating an indoor air ion therapy space that promotes human metabolism and enhances immunity. This fresh and purified air is highly beneficial to people's health and can effectively prevent pathogens. Passive Purification: Three-layer, four-stage high-efficiency composite filter: High-density PP pre-filter removes various pollutants larger than 5-20 microns, such as hairs, fibers, and pollen. HEPA filter removes over 99.97% of particles with a diameter of 0.3 microns (about 1/200 of a hair's diameter). Activated carbon integrated filter adsorbs microorganisms and pollutants, absorbs and eliminates odors and harmful gases. Ultra-low noise of 22 decibels, with low-frequency purification at night to aid sleep. Enhanced humanized design, equipped with a child lock, extremely friendly for mothers and babies. 1.5-meter Type C USB cable for easy connection to power from any angle. Thoughtful filter replacement reminder. Added thick-handled carrying grip for freely portable fresh air. Comes with aroma pad, can add essential oil or Fragrance Four timer options: continuous operation, 2 hours, 6 hours, 12 hours. Three purification speeds to choose from: Sleep/medium/high. Safe with child lock. USB power connection, very convenient for desktop use . Soft Warm blue LED Lamp to show the working status