No problems with this format. Excellent headphones. It has a good range of reception. Hope it helps and happy searching! Muy buen producto, lo recibí un día antes de la fecha incluye todo lo mencionado en la descripción Incredible sound quality at low to mid volume withslightly noticeable loss of quality at max volume, but I think it was just the bass drowning everything else. These have a very balanced sound for the most part, but a slight emphasis on the bass. I end up buying a few pairs a year. I?m 5?3? and they fall about 2. Easy for him to put on his self and can wear them anywhere.