Excerpt: Hi, this review is about Denon AH-C452 In-Ear Headphone. This may not be a popular high street brand but the quality is very high. It provides clearer sound by shutting off external sound. It is designed with accoustic optimising technology, that it adjust the sound pressure balance in front of and behind the diaphragm. It also comes with 3 pairs of detactable ear buds for comfortable fit. They are in 3 different sizes.