Purification volume button: Select different cleaning levels from LOW to HIGH.
Instant Clear NEA120 True HEPA 3-in-1 Air Purifer w/Filter with UV LED for Allergies Black The High CADR and Strong Airflow allowFor strong Air Purification Capacity letting the fresh air evenly flow through the whole room.THE Ultra-silent Technology and User-friendly Sleep Mode offer you a quiet, dark, and comfortable sleep environmentThe Ultra-silent Technology is only 32dB on lowest fan speed so it is very quiet and produces fresh air without disturbing annoying noise! Eureka Air Purifier is very easy to operate, only 3 buttons will meet all your requirements about an Air Purifier.