Exceed Sports Earphones with XFit System for iPhone 4/3GS/3G, iPod Touch, nano, shuffle, Microphone, Track Control, Volume Control, Sweat Resistant Innovative XFit system keeps earphones comfortably in place even during rigorous activities Step-up to Exceed's premium audio with breathy vocals, delicate musical details and tight bass Sleek InLine control includes: volume control, function button, microphone and Voice control 4 sizes of ECO (Ear Canal Opening) rings work to fit individual ears 2 Pairs of swappable Personalizers included.