Review Etymotic Research ER4S MicroPro Reference Earphones
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The ERâ?¢4 MicroProâ"¢ earphones are the next best thing to live music, with noise isolation far surpassing that of active noise-canceling earphones. The ERâ?¢4s require NO batteries, and can be plugged into any audio source. Their external noise exclusion -- 35 dB with 3-flange eartips, 42 dB with foam eartips -- allows you to hear the full dynamic range of recordings without having to play them at unnaturally high and unsafe levels. The earphones come in three styles: ERâ?¢4B, ERâ?¢4S, ERâ?¢4P.
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Etymotic Research ER4S MicroPro Reference Earphones Feature
