The high-performance balanced armature drivers are specified for a response accuracy of 85 percent or better, while the tuned acoustic-insert technology and low impedance ensure crisp audio directly from your source of choice. With an impressive 35–42 dB of noise isolation, these IEM’s high sensitivity means no portable headphone amp is needed. The 4-foot, Kevlar-reinforced cable terminates in a 3.5-millimeter stereo phone plug, with a detachable lapel clip and Y slider that helps prevent tangles during storage.