When playing music, the music will cover the sound, but when left idle, you can definitely hear it. Product was delivered to wrong address. Recomiendo que sea usada con cualquier base vertical para permitir una mayor ventilación por tener un mayor consumo de energía. These shelves were exactly what I was looking for. Meaning, even if you put all the pieces into it, theres a wide gap at the end that allows the pieces to fall over and get disorganized. (Note: the rounded insole is common to lots of "cushy" slippers Ive seen in the stores. We frequently hang two full size towels on it. My shoe size is 40, therefore I expected them to fit me. They tend to catch on steps when you are walking up them. I just put these on and have no trouble what so ever.