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ER•4 MicroPro™ Earphones |
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In-The-Ear Technology
Etymotic Research was the first company to develop commercial products
utilizing in-ear technology, with the introduction of the ER•1 and ER•2 insert
earphones in 1984. Etymotic remains the leader in insert earphone design,
offering the widest selection of insert earphones for use in hearing testing,
electrophysiological testing and psychoacoustic research, as well as in-ear
music monitoring and music listening. Our insert earphones provide the highest
response accuracy and noise isolation of any earphones in the world.
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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 and other patents pending.
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