Mini Purifier Compared with other purifiers, this USB plug-in purifier is small in size and allows you to travel easily. It can efficiently remove odors from hotel rooms, kitchens, bathrooms and toilets, pet odors, Cooking odors, second-hand smoke, etc., keep the ! Negative purification function: The generator generates negative ions, which are combined with the dust of positive ions in the and sink to the ground to avoid the danger of inhaling floating objects. And to achieve the removal of smoke, oil fume and other particulate matter. Effectively freshen the and the quality of . Low noise, environmental protection and health: This filterless purifier allows you to work immediately without replacing expensive accessories, just plug it. Release 20 million negative ions, so harmful dust carried by positive ions in the loses vitality. Easy to , plug and play. Product name: USB purifier Negative concentration: 20 million pcs/cm plug type: USB Working principle: negative Noise: 36 (dB) volume of purifier: 301-400 cubic meters/hour Applicable area: 31 (inclusive)-40 (inclusive) Colour: black Material: ABS+metal Package Contents: 1 * USB purifier Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.