It doesn’t look like much, but, simplicity is at the core of its’ effectiveness. I had a nagging cough which kept me up night after night, as well as my wife. I couldn’t seem to clear my chest. After using this device for a few minutes, I was coughing and snorting up a ton fo phlegm. The experience was dramatic and not exactly pleasant, but it was over quickly and I was able to sleep for hours without coughing. I use my air pysio often during the day and I do an extended session every night before bed. It works.