I received Instant Air Purifier in Charcoal color for a small room to test. I was quite surprise by the how quiet the low setting is. You can’t even hear it running on low. On medium, you can hear a low white noise. On high, you can hear it blowing. The nightlight is also so strong. I left it running outside of my room last night and I thought it was almost morning since there was so much light coming from my door. When I check my phone, it was only 1am and the light was from the nightlight. I couldn’t believe it. I did shut the night light off and went back to sleep. I like the size the air purifier, its not too big or small. It’s perfect for my daughter’s room. My husband said that he can tell a difference in the air. He said he could breathe better and didn’t have notice any allergies anymore. This is a plus for my family.