Audio-Technica ATH ANC3 NoiseCancel Earphone BK! Ultra-compact in-ear design is ideal for travel Advanced electronics cancel up to 85% (20 dB) of background noise Innovative ANC circuitry delivers an exceptionally pure audio signal in noise-cancelling mode Ideal for use with all audio sources, including MP3 & other portable players Soft interchangeable ear pieces (small, medium & large) provide a custom fit