Features: Dual moving coil units make the middle and high frequency more natural and bass stronger. Built-in Mic enables hands-free calls. With in-line control, easy to control volume, music and calls. In-ear design headphones with 3 sizes of silicone earcaps guarantees long time wearing comfort. Universal 3.5mm gold-plated plug, compatible with smart phone, Tablet PC, MP3 and other 3.5mm audio devices. You don't have to worry about running out of power, give you unlimited wired listening.