Universal Compatibility: Play audio from any phone, tablet, iPod, laptop or other media-playing device on your headphones, Hi-Fi or car stereo (fits standard 3.5mm aux ports). Step Down Design: Accommodates SmartPhones & MP3 cases allowing plugs to be fully seated even when bulky protective cases are used. Best Sound Quality: Built with the same grade materials as premium headphone brands. 24K gold-plated contacts ensure the cleanest sound experience possible. Works with any device equipped with standard 3.5mm audio jack or AUX-in port