Etymotic ER4XR In-Ear Extended Response Earphones

Here we have the Etymotic ER4 Extended Response model headphones. These are new open box headphones from our retail store.  They come in the original box with the accessories.  The box has some "retail" wear on it that can be seen in the photos. From Etymotic: In-ear Invented here: Over 30 years ago, Etymotic invented noise-isolating, in-ear earphones. Etymotic’s original design, developed for auditory research and hearing testing, used balanced –armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. ER4 earphones were the first high-fidelity, noise isolating in-ear earphones to use this technology in a consumer earphone, and are recognized as the world leader for response accuracy to which all other earphones are compared. In a Class by Itself Etymotic invented noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first earphones commercialized using balanced armature  technology and are recognized as the w