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Sony's MDR-E829V Fontopia Ear-Bud Headphones feature high-quality 16 mm driver units, Neodymium magnets for powerful bass and clear treble sound, a Sony Acoustic Twin Turbo circuit that uses sound chamber and ducts for improved efficiency, in-line volume control, a compact winding case, and a super-light in-the-ear design that fits snuggly yet comfortably.