Static Noise
I have poor hearing in one ear and purchased these amplifiers.  The trick to get these to work correctly is to make sure that the you have the right earpiece attached that fits properly so you don't get the screeching feedback tone once you put in your ear.  After a few times, I was able to fix that problem, it did amplify the sound, but strangely whenever I went to the kitchen sink, turned on the water, the ear bud turned into a static noise as it picked up the sound of the running water.  Weird and very annoying. Having it stuck in my ear also was uncomfortable to some degree and noticeable.  I'll just continue to turn my head with my good ear until I figure something else out.  Returned for a refund, which went through.
Rating: 3 stars