The Denon AHC350 inner ear headphones reproduce the original sound with a quality that is always satisfying. This headphone features an acoustic optimizer structure that ensures ideal sound characteristics and the canal-type design fits snuggly into your ears. Denon sound quality is delivered directly to your ear. An acoustic optimizer structure generates ideal acoustic characteristics by adjusting sound pre(5??nce around the diaphragm. The canal-type design reduces ambient noise and lets you enjoy the music more.