Earbay Professional Headset with Special USB Controller for High-Traffic Call Centers Professional Monaural design for high-traffic call centers, computer, game player.Compatible for the most telephones in call center. Special USB controller External volume control, up to 25 levels digital volume control for the headset speaker. External intelligent mute button with LED indicator. Comfortable wear, compact appearance, human engineering design, Can be uninterruptible using.The headset clip can be stretched freely and comfortable wear. Lightweight design with soft earplug. Direct connect over the head headset, no additional amplifiers or adapters required. auto identify, support hot plug. Noise cancelling Microphone to increase the voice clarity.with adjustable 270 degree plug rotation, providing clear communication.