Nominal noise level (when the horizontal distance of 70CM from the purifier, the maximum noise generated by the three-speed wind speed is 46.5 decibels)that gets generated while the product is in use. Protable air purifier:YIOU air purifiers HY3800 is 8.27 x 8.27 x 13.78 inches,4.41 Pounds,which is small home air purifier,easy to carry,you can put it in your bedroom,large room,office. Certified for Safe& Quality:YIOU air cleaners have FCC & ETL certified, also passed California air resources board (CARB) for indoor cleaning devices.Abandoned using uv light, YIOU air purifiers is totally ozone free and never produce secondary pollutant. Filter change:When the indicator light flashes continuously,it means the filter needs to be replaced.It is recommended to replace your filter every 6-8 months,the specific situation depends on the length of time you use and the air quality.When you reset the filter,please press the power button until the purifier beep three times. Air purifiers for Smoke:The toxin absorber activated carbon filter adopts high-grade granular carbon can do chemical decomposition and absorb harmful gases more effectively,suitable for the indoor environments with more toxic and hamful gases, smoke, smog, and volatile organic compounds(VOCs). Air purifiers for pets and Odor Elimination:The pet allergy replacement filter with the advanced carbon particle filter for ammonia removal,effectively remove pet odors and trap the pet fur，helps people with asthma and allergies. Greater and multifunctional Filters:YIOU HEPA air purifier have three kinds of replacement filters, consist by three layers with larger area of HEPA filter which help the YIOU HEPA filter air purifier remove most of dust,pollen,pet dander,smoke,mold spores. Smart & Energy-saving: The Auto mode automatically optimizes the fan speed based on the level of indoor air quality,choose the timer (1/4/8 hr)to customize the usage，all of these not only convenient but environmental,it's a good gift choice for your family,friends. Feel Air Quality Change :YIOU air purifiers for home adopts high precision semiconductor gas sensor to detect the air,through the change of brightly colored LED turn to red/yellow/green to reveal poor/good/excellent air quality. High Efficiency:With 3-stage enhanced filtration system and 360° True HEPA filter efficiently traps pollution from every direction,let you be free from the air pollutant in 9 minutes within a room up to 269 square feet, suitable for bedroom up to 547 square feet.
