Llevo unos meses con ella y no hace ruido y no me ha dado ningún problema, muy buena In fact, I am quite delighted. Its pretty minuscule; provides some softening but could provide more. For $40 these are astonishingly superb sound delivery. It is good quality but a little costly. Says "SMALL 5-6" on the shoe. Have not stressed the battery life, but I have not needed to charge it for several days since I use them only an hour a day for workouts. Sound quality hard to fault for the price and battery life is exceptional. The drive is not silent, as in how silent an SSD would be, but you need to be less than 2 feet away in a quiet room to hear the spinning. At first I thought the rods were a bit short but they are fine.