The working volume of the air purifier does not exceed 25db, and you can use it in the office or bedroom without any interference.The negative ion generator can effectively absorb compatible withmaldehyde, and can release up to 50 million negative ions per minute to solve the air quality problems around you, keep you away from dust, pollen, peculiar smell, cooking smell, and eliminate second-hand smokeUSB charging, low power consumption, can be charged at any time. Zero ozone and no radiation, safer and healthier to use.Portable wearable necklace design, because this small air purifier is equipped with a necklace, you can hang it around your neck. Whether you are flying by plane, train, bus or in a gym, crowded elevator, or in an office, you can wear it and enjoy safe and fresh air.Simple and small, hung around your neck and in the car, so you can breathe fresh air wherever you go. This is also the perfect gift compatible with family, friends and office partners.Air volume of air purifier: 50 cubic meters/hourcolour: blackMaterial: ABSSize: 6x6x2cmPackage Contents:1 x Air purifier1 x USB cableOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.