Skullcandy Supreme Sound Riff Headset for Phones - Retail Packaging - Blue/Black The in-line Mic1 system allows you to make/receive calls, play/pause music, and change tracks all from the microphone on the cord. Plus, the 3.5mm jack makes these headphones compatible with most smartphones and MP3 players. Promising connectivity, comfort, and of course Supreme Sound, the minimalistic Riff delivers the perfect blend of talk and rock to the mobile user The closed acoustic design means that there are no external distractions when it comes to your music, so you can enjoy the sound and nothing else.