POLY Blackwire C5220 USB-A Headset. Product type: Headset. Connectivity technology: Wired. Recommended usage: Office/Call center. Headphone frequency: 20 - 20000 Hz. Cable length: 1160 m. Weight: 164.2 g. Product colour: Black from Quzo UK at £135.74. Wear it well<br>The Blackwire 5200 Series