Etymotic invented noise-isolating, in-ear earphones. Etymotic's original insert earphone design, developed for auditory research and medical diagnostics, used balanced armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. Features 20 Hz - 16 kHz frequency response and 35 dB - 42 dB noise isolation. Includes carrying case and 2 sets of eartips, AccuFit eartips, 6,3 mm gold-plated stereo adapter and t-shirt clip. Weight: 164 g. Finish: Black.