Etymotic Research ER6i Isolator In-Ear Earphones (White) (Discontinued by Manufacturer) Use with MP3, CD, DVD players and personal computers Lightweight, compact, fits in your pocket; no battery required Highest noise isolation (15 to 35dB) Frequency range of 50 Hz - 16 kHz Includes ER-6i earphones, cord with stereo plug, one pair two-flange eartips, one pair foam eartips, two replacement filters, filter changing tool Use with MP3, CD, DVD players and personal computers Lightweight, compact, fits in your pocket; no battery required Highest noise isolation (15 to 35dB) Frequency range of 50 Hz - 16 kHz Includes ER-6i earphones, cord with stereo plug, one pair two-flange eartips, one pair foam eartips, two replacement filters, shirt clip and pouch.