Etymotic ER-4 MicroPro Earphones
The Etymotic Research ER-4P stereo earphones feature an ultra-lightweight design, 35 - 42dB of external noise attenuation, and an enhanced output level for both the high and low frequency range, a combination that ensures clear, natural listening enjoyment at safe and moderate playback levels. These earphones are specifically designed to accompany all manner of portable audio listening devices, with no additional amplification required.
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