Features
ER4 XR
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.  Kit Contents  Closeup  ER4XR Extended Response Earphones PRODUCT INFORMATION | Publisher | Etymotic |
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| Media | General Merchandise |
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| Length x Width | 9.25 x 6.25 inches |
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| Shipping Weight | 0.96 pounds |
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| East Coast Music Product Code | ZHL214954 |
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| UPC Code | 846430002029 |
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| Code | ER4XR |
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| 1st Publication Date | 11/2016 |
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