Purification volume button: Select different cleaning levels from LOW to HIGH.
On/off button: Activate your air purifier. Eureka Instant Clear 26' NEA120 Purifier 3-in-1 True HEPA Air Cleaner with Carbon Activated Filter and UV LED, for Allergies, Pollen, Pets, Odors, Smoke, Dust.AHAM Verified room size is 222 sq feet, with Long Distance Air Circulation Technology, the air purifier can establish a great airflow through a room and be a lot more effective at filtering the entire room, even at low speed.