Portable music players have been around since the 80's. Back then it was the Walkman, today it's an iPod or a cell phone. Regardless of what you use to listen to your music on the go you need headphones.
Deep rich bass; Good sounding dialog in movies; Noise isolation; Stylish design; Removable ear pads; iPhone support
High price; Ear pads will heat up your ears; High frequency playback