Featuring the unique Koss D-Profile earcup design, the CS200i fits the shape of the ear for the perfect fit. The flexible, hands-free electret noise-cancelling boom microphone with detailed sensitivity and reduced sound distortion is perfect for multi-taskers. The Koss CS200i communication headset headphones connect to devices through a single 3.5 mm (TRRS) plug for analog headphone and microphone audio. The all-new CS200i communication headset headphones are perfect for the office, language learning programs, or taking internet conference calls.