HEPA Filter Design, Complete Air Purification HEPA filter and activated carbon structure. It produces a concentration of 5 million negative oxygen ions, removing 99.97 percent of PM2.5, Formaldehyde, bacteria, pollen, smoke, mold spores, dust, odors and pet dander. Purifies the air and improves your health. Ideal for people who suffer from allergies, nasal stuffiness, cough, sneezing, asthma, etc. Cotton filter for essential oil diffuser use. Features: 1. Small and beautiful air purifier for small room, easy to carry, USB Power line. 2. Isolate the floating dust in the air and mold spores. 3.Improve breathing; reduce the incidence for allergies and pets. To improve the heart, Cerebrovascular disease symptoms. 4.Remove bad smell, smoke, odor; make people invigorating,;eliminate fatigue and burnout;improve work efficiency. 5.Improve the quality of sleeping; eliminate neurasthenia. 6.Purified fresh air would help calm the volatile emotions. 7.Anti-static to reduce the computer screen radiation on the body damage. 8.Reduce the suspended bacteria, pollen and other irritants to the skin damage, there is an obvious cosmetic effect. 9.Decompose harmful substances; effectively kill mites; prevent various influenza. Specification Color :White Material: ABS Product size: 125 * 194mm Packing size: 150 * 150 * 235mm Voltage: DC5V Standby power consumption: ?0.2W Working Power: ?2.5W Product Weight: 0.55kg Amount of negative ions: 5 * 10 ^ 6 / cm3 Application area: 10 square meters around Power Source: USB Interface Model: anion sterilization Scope: bedroom, desk, study, pets, toilets, etc.