... control for calling center oem/odm service,competitive price Noise Cancelling Telephone Headsets with QD & RJ-11 & volume ... design , metal goose neck mic boom , ultra durable ,Noise cancelling Microphone , providing clear communication . 2. Acoustic shock protection ... Adjustable Headband Quick Disconnect feature for added freedom(Optional) Noise Cancelling Telephone Headsets with QD & RJ-11 & volume ...