PRODUCT GRADING (Grade B) - Good Condition > Very light scratches and light signs of use > Refurbished to the highest standards. Original Retail Box WHAT IS IN THE BOX Aidodo Air Purifier for home with HEPA & UVC Filter Sterilization Light, Filtration Effects 99.97% Dust LED Clean Air Light Low Noise PRODUCT DESCRIPTION THREE-LEVEL FILTRATION: Pre-filter ， True HEPA filter and high efficiency activated carbon filter work together seamlessly to eliminate 99.97% of airborne germs, dust mites, mould spores, allergens, odours, pet dander, smoke, cooking and VOCs (volatile organic compounds). UVC light: currently the purifiers on the market have only a filtering function. Aidodo purifiers have the new UVC sterilization, which sterilizes on the basis of filtration and purifies your air more effectively. Night Mode Air Purifier: Long press the On / Off button for 5 seconds after power-on, the machine switches to the lower speed and runs quietly, Aidodo will not disturb your sleep. IMPORTANT HINT FOR FIRST USE: The machine filter has a cumulative timing function. When the machine has accumulated more than 2500 hours （3 months） of work, the blue light flashes, then the filter must be replaced. The replacement filter must be replaced every 3-6 months depending on the air quality in your area and using the air purifier to ensure the best results. Quality assurance and ideal gift: The HEPA air purifier has got CE, RoHS certificates. Ideal gift for people suffering from allergies, stuffy nose, cough, sneezing, asthma, etc. 3-Stage FiltrationThe Fine Preliminary Filter, True HEPA Filter, and Activated Carbon Filter work seamlessly together, keeping your indoor air fresh and clean.When the machine has accumulated more than 2500 hours （3 months） of work, the blue light flashes, then the filter must be replaced. The replacement filter must be replaced every 3-6 months depending on the air quality in your area and using the air purifier to ensure the best results.B08MDYSVJR).