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