Etymotic ER6 Research Er 6 Isolator Earphones Noise isolation (34-36 dB) far surpasses that of active noise-canceling earphones Use with the iPod, MP3, CD, DVD players and PC No batteries required 5' cord with 3.5mm stereo plug Includes 1 pair 2-flange eartips, 1 pair foam eartips, 2 replacement filters, filter changing tool, shirt clip & pouch