The NoiseBreaker is custom made from a soft and flexible silicone rubber and does not move in your ear - however vigorously you exercise. The earphones - whether wired or bluetooth - clip into a specially drilled hole on the NoiseBreaker's outer surface, and the music or phone call are then transmitted down the through channel, thus providing excellent sound quality, even in a noisy environment.
The problem with standard mp3/phone earphones is that they tend to move and be uncomfortable in the ear - especially if you are doing exercise. Emtec NoiseBreakers, used as a housing for earphones, solve this problem!
'I'm a professional drummer and drum educator and think the NoiseBreaker product far outstrips the hundreds of other ear protection products I've tried' - L.Smith, DRUMSMITH Studio.