Sennheiser 504403 Headset - Wired USB connectivity - easy handling and convenience for connecting to a softphone Best-in-class comfort - CircleFlex patent-pending dual-hinge ear cup system that adapts seamlessly to your ears, for instant perfect fit and relaxed all-day wearing Noise-canceling microphone - filters out ambient noise for optimum speech clarity Unique robust construction - crafted with look and feel in mind Single-sided wearing style - numbered headband grooves for step-by-step adjustment for instant perfect fit