A true dual-driver earphone designed to expand your audio horizons, the W20 uses separate bass and high frequency balanced armature drivers to enhance your listening experience with incredible detail and dynamics.Westone True-Fit Technology50+ years experience with in-ear applications has yielded a lowprofile, lightweight, universal earpiece which delivers maximum comfort and in-ear coupling for dynamic transfer of sound.Replaceable CableNew replaceable cable connection includes the braided epic cable and round MFI cable with 3-button control and mic.3-Button Apple Control System + MicFunction control for Apple products including volume +/- , tracking +/- , phone answer, and siri activation.Balanced ArmatureWestone-s balanced armature drivers are significantly more compact and efficient than traditional dynamic drivers. By combining multiple balanced armature drivers with sophisticated crossover networks, Westone monitors provide enhanced sonic detail and frequency range that extends well beyond typical in-ear solutions.Exchangeable FaceplateBlack, blue and red color faceplates with secure attachment.Mini Monitor VaultConstructed of a high-impact polymer, it-s the perfect size for travel and storage. Features a protective foam interior and weather resistant design.