Etymotic ER4XR Extended Response Noise Canceling Earphones with Extra Tips

Etymotic Research
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Over 30 years ago, Etymotic invented noise-isolating, in-ear earphones. Etymotic's original design, developed for auditory research and hearing testing, used balanced -armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. ER4 earphones were the first high-fidelity, noise isolating in-ear earphones to use this technology in a consumer earphone, and are recognized as the world leader for response accuracy to which all other earphones are compared.

Specifications and Features:
35dB 98% noise isolation
First earphones to completely seal the ear
Reduction of outside noise reduces the risk of listening at unsafe levels
2 year replacement warranty
Comes w/ detachable, 5ft. cord w/ 3.5mm gold plated stereo plug
1/4" stereo phone adaptor
Assortment of eartips
Filter removal tool & replacement filters
Shirt clip
Zippered storage case