Etymotic's new reference standard hi-fidelity earphone for those who demand nothing less than the highest fidelity.

Etymotic invented noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first earphones commercialized using balanced armature  technology and are recognized as the world leader in response accuracy, to which all other earphones are compared. After more than 20 years, these reference-quality earphones are still the choice of serious sound engineers, audiophiles and musicians.

Backed by decades of research and development for the ear
World leader in sound reproduction

Unsurpassed frequency response accuracy and sound quality — 92%+ response accuracy from 20 Hz – 16 kHz
The only earphones with balanced-armature, precision-matched, custom-tuned drivers
Highest output sensitivity in its class
Timeless style and fit

Professional quality and reliability
An assortment of noise-isolating eartip options to ensure proper seal and comfort
Highest noise isolation

First earphones to completely seal the ear
98% (35 dB - 42 dB) noise isolation —highest of any earphones or headsets on the market today
Reduction of outside noise reduces the risk of listening at unsafe levels
Best durability and warranty

2-year replacement warranty
User-replaceable filters protect the balanced-armature drivers from ear wax
What’s In the Box?

Earphones
Detachable, 5 ft. cord with 3.5mm gold plated stereo plug
¼” stereo phone adaptor
Assortment of eartips
Filter removal tool and replacement filters
Shirt clip
Zippered storage case
Performance certificate