Control Method Touch Filter Type HEPA Noise Level 45 dB Product Dimensions 3.86"D x 7.68"W x 3.15"H [Efficient three-stage filtration and real HEPA filter] Our automobile air purifier is equipped with three-stage filtration system, pre filter, real HEPA filter and activated carbon filter. It can remove 99.97% of the dust, smoke and smell in the car. Filter particles of 0.3 μ m and above, and filter PM2.5 air pollution. The filter can be replaced, and the air purifier can easily enjoy fresh air. [LED light and built-in fragrance box] When the purifier is connected, 8 LED indicators will be on continuously. The built-in fragrance box allows you to add essential oil and create a fresh and romantic fragrance environment. Buy a small air purifier and make it your warm friend on the trip. [Portable and easy to operate] Dimensions of portable air purifier - width: 2.73 inches, length: 7.44 inches, height: 3.50 inches. The weight is 0.83 lb. It can be carried by travelers. The small air purifier is equipped with USB plug, and is compatible with car charger, power bank, laptop, etc. Plug and play makes it very easy to operate. Low noise operation (45dB) [Powerful function, wide application] The dedusting air purifier designed with 360 ° air intake will thoroughly filter the air in small areas such as cars, desks, dormitories and children's rooms, creating a good office/learning environment. [100% satisfied professional after-sales team] We provide free returns and 24-hour online customer service. If you have any questions, please contact us via Amazon email. We will try our best to meet your requirements