Epos SC635 USB A headset  provides Ultra noise-cancelling and Active Noise Cancellation microphone headset for optimized speech and Sennheiser sound. This model has dual USB A and 3.5mm connectivity. It has a modern, stylish design. Extension headband with number indications for accurate adjustment. Microphone boom arm design is adjustable fit.  Not only that, it sounds as good as it looks—with high-quality audio you’d expect, Connects to PC via USB. Simplicity and reliability . In-line call control for easy call management.