Air purification measured: https://www.youtube.com/watch?v=MJ71t39hWYE ● South Korea original, sales of the first brand, the best design and high quality. ● High efficiency HEPA-H12 level function, which can remove PM2.5 (0.3) up to 99.5%. (The diameter is less than PM2.5 microns, called "ultrafine aerosol"). ● It can remove polluted air and ultra-fine dust in the space, with 99.9% sterilization effect. ● Two-stage high/low air volume adjustment and extremely low noise performance. ●HEPA-H12 filter / use for about 360 hours (recommended 3 hours / day x 4 months) need to be replaced. ●The LED light is on to remind the filter to be replaced (the red light needs to be replaced). ● This machine can produce more than 2 million/cm3 unit of negative ions per cubic centimeter. (tested by the Korea Far Infrared Association) as if fentanyl is absorbed in the forest. ● Ions are charged atoms, both positive and negative, when negative ions and air The dust particles in the collision are adsorbed to help balance the stable air quality. ●Applicable for use inside, outside, office, bedroom, baby carriage, etc. ● One HEPA-H12 filter is included, and H12 can really absorb PM2.5 (0.3). ●The host coating material has been approved by the US Environmental Protection Agency (EPA) to be 99.9% resistant to mildew and bacteria. How to use: Use car power supply limit DC12V, outdoor use, please prepare mobile power. Contents: host x1, HEPA-12 filter x1, car charger x1 USB charging cable x1, strap x1 Place of Origin: South Korea Date of manufacture: Depot base marking Weight: 233 grams Shelf life: 1 year warranty after unpacking Note: Do not drop the electronic product to avoid affecting normal operation.