Features: Powerful neodymium magnet driver unit enhances the responce performance and offers deeper and more powerful bass. The metal acoustic chamber reduces chamber resonate and makes a clearer treble sound, delivering purer audio experience. Light-weight in-ear headphones with 3 sizes of earcaps ensures a long time comfortable wearing and noise isolation. One button calling control with Microphone is for hands-free answering and ending calls while doing other things. Universal 3.5mm gold-plated plug, compatible with smart phone, Tablet PC, MP3 and other 3.5mm audio devices.