Aud&eacute;o Perfect Fit Earphones with Microphone 122 (Black) Crystal-clear sound with articulate bass tones and sparkling highs that never fatigue your ears. Swiss-precision technology from Phonak, the world's leading hearing systems manufacturer Comfortable fit and lightweight design: perfect for travelling, working out or just relaxing Interchangeable audio filters to change frequency response and customize the sound to your tastes Microphone is compatible with mobile digital devices and computers with a 3.5mm stereo jack