High Efficiency HEPA FilterHEPA filter material, the concentration of negative ions is 15 million / cm, and the purification efficiency is 50-80m / H. It can effectively remove smoke, haze, pollen, pet hair, peculiar smell, etc. in the air, providing a comfortable environment. Portable Design It is applicable to almost any indoor environment. It is powered by a USB socket and comes with a 1 meter USB cable. It can work just by connecting the power supply. The product design is light and small, more convenient than traditional household air purifiers, with low voltage and low power, and safer to use. Quiet and with NightlightThe noise level at work is 35 Db, which will not disturb your sleep. accompany to sleep. Wide ApplicationThe applicable area of the purifier is 11-20 square meters, suitable for small rooms, small working areas and parking spaces. NoteThe product has a built-in filter, does not require cleaning, it is recommended to replace the filter every 3-4 months.