The Koss Porta Pro Communication Headset features a flexible, hands-free electret boom microphone with detailed sensitivity and reduced sound distortion is perfect for multi-taskers. The Koss Porta Pro Communication Headset headphones connect to devices through a simple 3.5mm TRRS plug that works with modern desk phones, computers and tablets. The Koss Porta Pro Communication Headset also features Comfort Zone adjustable temporal pads to relieve pressure on the ears as well as a collapsible design for ultimate portability.