AOER 4-pin Call Center Telephone /IP Phone Headset with Adjustable Boom Mic Modular Connector for 3Com Aastra Alcatel-Lucent Audioline Ericsson ESI All of our items are Brand New. Microphone noise abatement, real sound body aircraft operator. Screw headphone cable, avoid the use of the process wound. Flexible metal hose, MIC positioning accuracy, structural design, durable, comfortable to wear. Sold exclusive by AOER.