[Capture 99.97% of air particles] Advanced purification technology can capture 99.97% of air particles, and eliminate car or indoor smoke, odors and pollutants through H13 real 4-stage filtration. [Negative oxygen ions] According to research, negative oxygen ions can not only effectively remove and neutralize harmful gases such as methanol, formaldehyde and carbon monoxide in the air, also increase the body's function and immunity. At the same time, the device continues to impurities and harmful substances in the air through the principle of air circulation, providing you with a and healthy environment. [Low noise] This air purifier is about 10 decibels at work, so it will not cause noise problems regardless of sleep, driving, work, etc. [Easy to use and carry] The size of the device is roughly the same as the water cup, so you can carry it with you in your backpack. At the same time, the working conditions are simple, such as car charger, computer, mobile power and USB interface. [Simple and design] The device adopts H13, real HEPA, and simple white cylindrical design style, which is simple and . We recommend replacing the filter for about 6 months color:White Material:ABS size:65 x 158mm Package Contents: 1 x Air purification tools 1 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.