• Original high fidelity in-the-ear earphones
• Designed to match the response of the ear, creating nearly perfect sound reproduction
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• Sound accuracy surpassedonly by the ER-4S
• High noise-isolation
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• Higher sensitivity for compatibility with all personal digital music players
• Enhanced bass response to accommodate individual preference
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• Compatible with iPhone and other mobile phones
• Response accuracy of Etymotic's ER-4 earphones
• Highest noise isolation of all competing headsets
• 3.5mm stereo plug makes the hf2 compatible with any music player
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