I’ve had similar ones in the past. Putting the bars on might be a little confusing at first, especially for someone who doesn’t read the included directions. In conclusion, I understand why some people would want to return these after putting them on and hearing the sound for the first time. These boots are really cute. Primero pensé que era error del audífono y se los preste a un amigo que sabe mas de estos menesteres, me dijo que no tenían ningún problema, que incluso le gustaron mucho y que quizá compraría un par. The four discs come in a handsome multicompartmented case which looks great on your library shelf. They are super versatile. My case opened from the weight of the product and closed again. I recommend the seller They do supply 3 different size eat pieces, and I did try them.