Air fresher 1.pre-filter 2.electrostatic precipitator 3.uv-led photo catalyst, ozone sterilization and filter 4.anion Air Purifier/air fresherYitianneng intelligent air purifier can get rid of formaldehyde, benzene, ammonia, smoke, smell, dust, germs, diseases, pollen and mites in the air and release negative oxide ion and purify the air to improve the functions of lung and heart, sleeping, ...