This small device can be adjusted from a soft white noise sound very loud by turning the dial. If I place it near the front door of my apartment, it drowns out the sound of my voice if I’m having a discussion that I don’t want anyone to hear because when I walk down the hall, I can hear personal conversations. And I live in a high end condo and expected that sounds would be more buffered. I place it near me when I have a private phone discussion that I don’t want my other family members to listen to. It’s expensive, but assume that it will last a long time and that the technology that it’s made with is why the price is what it is.