ER•4 MicroPro™ is a trademark of Etymotic Research, Inc.  The ER•4 MicroPro™ Earphones are covered by one or more of the following
U.S. patents: #4,677,679, #4,763,753, #5,887,070 and other patents pending.

Next Best Thing to Live Music

• Transparent, reference-quality sound
  
• For audiophiles, performing musicians and recording engineers
  
• For mixing, monitoring and critical listening
  
• Accurate real-ear response
  
• Unsurpassed isolation from outside sound

The ER•4 MicroPro™ earphones are the next best thing to live music, with noise isolation far surpassing that of active noise-canceling earphones. The ER•4s require NO batteries, and can be plugged into any audio source. Their external noise exclusion -- 33 dB with 3-flange eartips, 41 dB with foam eartips -- allows you to hear the full dynamic range of recordings without having to play them at unnaturally high and unsafe levels. The earphones come in three styles: ER•4B, ER•4S, ER•4P.

System Includes

• ER•4 MicroPro earphones
  
• 5 ft. cord with 3.5 mm stereo phone plug
  
• 1/4" stereo phone adapter plug
  
• Six 3-flange eartips
  
• 10 foam eartips
  
• Filter changing tool
  
• 4 replacement filters
  
• Shirt clip
  
• Pouch (not shown)
  
• Storage box