I am very pleased with these, and plan to order several more for stocking stuffers. Do not expect to hear any difference though if you plug it into a built-in amp in a Mac, iPhone, or other consumer device. They were made of high quality leather and they got more beautiful with saddle soap and age. Would definitely recommend, can wear all day. For an all-around training barbell, the amount of whip is good! Fits perfect with space for wires and a usb stick. Im looking gorgeous when Im at the nail salon for my pedicure. Definitely helped me to burn way more during the workouts. The vibration effect is cool, its nice you can turn it off as well if you need. Y por último al momento de realizar llamadas el interlocutor escucha perfectamente, felicidades.