Winext HEPA Air Purifier, covers 215 Sq Ft space, 3 Layer 3M Hepa Filter and 6 Million Negative ion, eliminate Long Lasting Smells, Removes dust, Bacteria's and improve immunity. Suit for both Room or car use, appliance for 10-20 square meters. Unique design to positioning diiferent place to best fit your space. Accessories:Car Adaptor / Belt / Non-slip mat / User Manual / Filter, home adaptor not included. 3 layer 3M HEPA filter helps remove up to 99% of airborne particles as small as 2 microns from the air passing through it: Built-in 3M composite air filter include 3M 4 in1 pre filters +3M electrostatic dust removal filter (HAF Technology)+ cocoanut active charcoal filter, have reminding of filter replacement function. Smart filter change reminding of 180 days. Smart to stop working if the protective cover opened by wrong operation to avoid injury. How does NEGATIVE ION work - Our Winext Car Ionizer uses an electrical charge to release tremendous amount of 60000000 anions which will remove microscopic the bad particles from the air, In other words, The ionizer creates negative ions which seek out positively charged particles, once the positive and negative ions are bonded together, they become too heavy to float, and no longer affect the air quality of the surroundings Newest generation patented desk air purifier with low noise but strongest unit for it's size producing more negative Ions and Ozone exactly as nature does after a thunderstorm, whatever you feel or not, the negative ion impove immunity as the forest or waterfalls environment.