Mini Air Purifier Compared with other air purifiers, the USB plug-in air purifier is small in size and allows you to easily. It can effectively remove odors from hotel rooms, kitchens, bathrooms and toilets, pet odors, cooking odors, second-hand smoke, etc., to keep the air fresh! Negative ion purification function: The air ion generator generates negative ions, which are combined with the positive ion dust in the air and fall to the ground to avoid the danger of inhaling floating objects. And to remove smoke, fumes and other particles. Effectively refreshes the air and improves sleep quality. Low noise, environmental protection and health: Filter-free air purifier allows you to work immediately without replacing expensive accessories, just plug it in. Releases 20 million negative ions, so that the harmful dust carried by positive ions in the air loses its vitality. Easy to use, plug and play. Product Name: USB Air Purifier Negative ion concentration: 20 million pcs/cm³ Power plug