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.
. . . . Sample Audio & etc. . . .
Closeup ER4XR Extended Response Earphones Kit Contents
| Media ||General Merchandise|
| Length x Width ||9.25 x 6.25 inches |
| Shipping Weight||0.96 pounds |
|East Coast Music Product Code ||ZHL214954|
| 1st Publication Date||11/2016|
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