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ER•4 MicroPro™ Earphones |
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Earphone Insertion Guide Video
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ER•4 MicroPro is a trademark of Etymotic Research, Inc. The ER•4 MicroPro Earphones are covered by one or more of the following U.S. patents: #4,677,679, #4,763,753, #5,887,070, RE38351, RE40696 and other patents pending.
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