Karnotech REMAX Dual-Driver Sport Earphones Wired Earbuds Neckband Style Headphones with Microphone & Volume Control for iPhone 6 6S Samsung Galaxy RM-S1 - Black Designed as supra-aural earphones and in-ear wearing patterns, perfect fit your ears with double reinforcement and no additional pressure while doing exercises. Advanced technology of insulating the sound and decrease the noise is adopted, effectively block the sound from outside environment and ensure the clear sound transmission of your music or your phone calls. Collated with soft ear caps and attached with three different sizes for the accordingly choices of you and others around you, enable the comfortable wearing and perfect sense of listening. Fever-level music configuration and quad core drive unit, with each channel containing two drive units, help creating shocking music sound; and triple frequency equalization presents a clear and pure timbre. Operation button which smartly compatible with IOS and Android system operation, with microphone inserted, answering phone calls, playing music and adjusting volume could be done through one button.