The Denon AH-C350 In-Ear Headphones offer a sound-isolating, canal-type inner ear design. They were created to reduce ambient noise, allowing you to enjoy more of the music content without as much background interference. The newly developed acoustic optimizer provides optimum performance by adjusting the sound pressure balance in front of and behind the diaphragm. Clearer bass and the critical low- to mid-frequency range are more dynamic for today's digital sources.