[Useful]Air purifier works 3-4min to capture 99. 7% of 0. 3-micron particles or larger, including pollen, dust, smoke, and dander. [High-Efficiency]The air purifiers can circulate room air over many times per hour to achieve rapid purification. [Practical]It guards your kids against pets hair and pet dander, allows all your family members to breathe pure air. [Low Noise]Designed on the base of the principle of hydrokinetics to operate below 32dB which will not affect your sleep or your work. [Great Gift]The air purifier makes a great and valuable gift for your friends and family.