AKG K15 High-Performance Conferencing/Assistive Listening HeadphonesK15 high performance on ear headphones evolved over decades of experience in the field of conferencing and set new standards. Sophisticated design is paired with high quality audio and advanced security technology. Optimal adjustment to any head size and light weight design allow hours of use, while forgetting the presence of these headphones. After the conference wiping with a simple hygienic tissue will prepare the unit for the next user, without