Nuwey Air Pure XL - Air PurifierFeatures & benefits 4 Stage filtration: Pre Filter, Anti Bacterial layer, H13 True HEPA, Activated Carbon. Captures 99. 97% of dust, smoke & allergens for cleaner air. Airdetect technology detects airborne dust to help maintain clean air. Smart indicator shows air quality (Blue = Good, Yellow = Moderate, Red = Poor). Fan control with Low, Medium, High speed options. Time control lets you manually set run time. Filter health monitor notifies when its