TelPal Corded Hands-free Call Center Noise Cancelling Corded Binaural Headset Headphones with Mic - Cord with USB Plug, Volume Control- For Computer/PC/Laptop Use Only It is using for computer only, not for the phones or telephones & VOIPS that have USB port. With volume control funciton.It with perfect voice quality. Noise proof microphone, to increase the voice clarity. Easy to use; no need the installation driver, auto identify, Comfortable wear, compact appearance, human engineering design, Can be uninterruptible using.The headset clip can be stretched freely and comfortable wear. Microphone volume can be adjusted high and low on the headset cable. Detachable Leather ear pad and Mic cushion to keep headset clearn and sanitary