Headset System Superb - Call Center Phone Headset + Headset Amplifier - Mic Volume Control, Noise Cancelling, Quick Disconnect. Don't Compare This Professional Headset with General Headsets. All Day Wearing Comfort, Compete with Plantronics and Jabra GN netcom High-Grade Headsets for Call Center, Telemarketing, Customer Representative. Multi Year Warranty, 20 Year Proven Quality in The World. Quick Disconnect headset(QD) + Headset Amplfier(Stretched lenght is over 9 ft)  Compare to Plantronics M22 / AP15. Universal compatibility with most of telephones like Toshiba, Nortel, AT&T, GTE, Siemens, Panasonic, Samsung and LG key phone, PABX, PSTN system.  Powered by PC USB port, no need a battery.(No USB communication)  Adjust your voice volume transmit to a customer. ( Direct cord connection doesn't have ) Noise cancelling Mic with Static shock protection : reduce background noise Flexible Goose-neck metal spring mic boom for an optimal positioning from mouse, Cost effective solution in Business-grade durability