The Cisco 521 Wired Single Headset is a professional headset optimized for Cisco IP phones, soft clients, and desktop video devices. It delivers vibrant sound for open workspaces. It features a lightweight form factor that is comfortable to wear, even for an entire workday. It's designed for users who spend a lot of time wearing headsets for voice communications and listening to music. Another key feature is powerful noise isolation with unidirectional microphones that are designed to hone in on the user's voice and simultaneously minimize background noise.