Etymotic Research is a brand that produces canal-type earphones, and other similar products, pursuing more accurate and better sound with the keyword “ETYMOTIC”. The ER-4 series, which debuted in 1991, uses a BA type driver unit found in hearing aids, and quickly gained tremendous praise from professional engineers and musicians. In recent years, not only high-end earphones, but also earphones for children and earplugs that protect ears from noise have been released one after another, and there are many high-quality items that provide safe listening and great sound.
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