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Etymotic Research ER4B
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| Brand | Etymotic Research |
|---|---|
| Type | Earbud/Canal |
| Driver | Dynamic |
| Connector | 3.5mm Mini Stereo |
| Online Price USD | $330 |
| Weight | 28.0g |
| Impedance | 100 Ω |
| Cable Length | 150 cm |
| Microphone | None |
| Noise Reduction | None |
| Isolation | 20 dB |
| Release Year (approximate) | 1991 |
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