This is a very nice looking hearing aid. It fits my ears perfectly. The most important thing is that it has noise reduction function, so that my ears don't have the feeling of exploding in a noisy environment. Operation is also very simple. At first, I felt that the operation was not very troublesome. Just adjust the volume to your own suitable volume. However, as long as you adjust it well in the early stage, you can use it directly every time you turn it on, and you don't need to set it every time you use it. great