Dear Srs, We are looking for call center headsets. These are the call center headsets that we are looking for: Specs. Call center headset binaural with call function With volume control and hang on / off button Call center headset binaural with call function and noise cancelling With volume control, hang on / off button and noise cancelling button Call center headset monaural with call function With volume control and hang on / off button Call center headset monaural with call function and noise cancelling With volume control, hang on / off button and noise cancelling button Headset with volumen control, noise cancelation and USB A  USB C connector USB A   USB C with adaptor premium quality