Poly Blackwire 5210  provide a best-in-class audio experience in a headset built for enterprise deployment. This model has dual USB and 3.5mm connectivity. It has a modern, stylish design. Its noise cancelling  microphone boom is flexible,  so workers can customize the fit. And the headset is fully adjustable with a comfort padded headband, pillow soft ear cushions, and 180-degree pivoting speakers. Not only that, it sounds as good as it looks—with high-quality audio you’d expect from Poly. Connects to PC via USB/USB-C and devices that support USB-C Corded simplicity and reliability . Easy call controls BW33xx: Call answer/end button, volume, mute . BW33xx-M: Combined call answer/end and dedicated Microsoft Teams Button, volume, mute.