BUILT IN DAC - reduces noise and improves sound quality, making it possible to enjoy calls and music in high sound quality. DELAY FREE - Enjoy to watch movie or play games on smartphone or PC without dealy. CLEAR SOUND - via 10.7 mm diameter neodymium driver SWEAT PROOF - Rated IPX2 for resitance to water splashing from any direction EASY TO USE - Remote control with three buttons (volume up, down, and Audio/Phone controls), and dedicated slide switch for the microphone ON/OFF.