about this project High Efficiency Three-Stage FiltrationThe car air purifier is equipped with a three-stage filtration system, pre-filter, real filter and activated carbon filter. It will filter up to 99% of particulate matter, such as smoke, dust, odor, PM2.5 particles, keep the air in your car clean and enjoy fresh air easily. Replaceable filter. DURABLE AND EASY TO OPERATEThe portable air purifier is made of high-quality carbon fiber material, which feels good to the touch, durable and has a long service life. Plug and play design makes this small air purifier easy to operate. The USB plug connects to your car charger, power bank, tablet, computer or laptop. Small but PowerfulThe mini air purifier is as small as a mobile phone, measuring 2.73 x 2.73 x 4.26 inches and weighing only 7.2 oz. Hidden design, does not take up space. It is very convenient to fit your car. Our personal air purifiers will purify your personal spaces such as cars and small areas of your desk. Its powerful airflow covers up to 107ft/10m and purifies the air in 10 minutes. Ultra Quiet Built-in Aromatherapy CottonThe car air purifier operates with less than 55dB noise, making you feel more comfortable when driving and sleeping. Add a few drops of essential oils to your car air freshener's HEPA filter to create a soothing or revitalizing scent for your car that is all your own.