● EXCELLENT QUIET - 750 sq ft office is without any noise at full power running. The sleep mode is quiet and only 34db, which is very suitable for rest and sleep. ● UV Light - UV air purifiers can help you keep winter colds and other viruses and bacteria from spreading. They can even prevent pests such as dust mites or cockroaches. ● MEDICAL GRADE H13 FILTER - True H13 HEPA filter remove out 99.97% of the dust, smoke, odor, bacteria and viruses in the air. ● CERTIFICATE - CE / ETL / KC / ROHS ● FACTORY CAPACITY - 60,000 Units/Month.