We developed the Jabra BIZ 2400 Duo with one goal in mind: to be the world's best corded contact center headset, delivering both best in class noise cancellation and acoustic shock protection, as well as the industry's only unbreakable 360 swiveling boom and Kevlar-reinforced cord. Connect to your PC, mobile or desk phone with QD (Quick Disconnect) connect cables. Also features Jabra's ultra-Noise Canceling Microphone reduces unwanted background noise and the noise-canceling microphones reduce unwanted background noise and are ideal in crowded and noisy, open office environments. that eliminates all ambient background noise and low microphone sensitivity (LS) for phones with their own high amplification.