In-ear design forms an acoustic seal that achieves outstanding sound isolation, blocking background noise, preventing sound leakage and allowing for increased fidelity at lower volume levels. Ultra high-quality balanced armature driver offers crisply detailed high-fidelity audio, reproducing the subtlest of sounds. Ideal for use with all audio sources, including MP3 and other portable players. Reversible design allows earphone to be worn with the cord extending either down or up over the ear. Interchangeable earpieces (small, medium, large) are included for a comfortable, custom fit. Includes protective pouch. Gold-plated mini-plug provides exceptional corrosion resistance, superb conductivity, low noise. 1.2 m Y cable includes an adjustable sleeve for secure fit.