The communication headset headphones are perfect for at the office, language learning programs, or taking Internet conference calls. The lightweight, single-sided design enables listeners to monitor the outside world while remaining comfortably connected. The CS195 communication headset headphones full range of sound brings conversations to life. Featuring the unique Koss D-Profile earcup design, the CS195 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 headphones connect to devices through two 3.5mm plugs for analog headphone and microphone audio. Frequency range: 20 Hz - 22 kHz, Impedance: 32 Ohm, SPL: 102 dB, Cable length: 2.4 m, Color: Black