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ER•4 MicroPro™ Earphones ER•4 Buy Now ER4B MicroPro Earphones BUY NOW - $299.00 Pair ER4P MicroPro Earphones BUY NOW - $299.00 Pair ER4S MicroPro Earphones BUY NOW - $299.00 Pair     BUY NOW For $299 a pair   Accessories Earphone Comparison Which ER•4 Is Right for You? Background Technical Specifications Instructions for Use Earphone Insertion Video About the Filters Reviews Customer Feedback In-the-Ear Technology How We Measure Response Accuracy How We Measure Noise Isolation Warranty Information   ER•4 User Guide » 424 KB

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