Features: 7mm and 9mm dual moving coil unit make the middle and high frequency more natural and bass stronger. Built-in Microphone enables hands-free calls. With in-line control, easy to control music and calls. Light-weight in-ear headphones with 3 sizes of silicone earcaps ensures a long time comfortable wearing. 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.