Overview : The new Plantronics Blackwire 315/325 corded USB headsets are easy to use, simple to deploy, and offer the choice of USB or 3.5mm connectivity. They deliver top notch UC features—with bottom line performance. Superior Audio Quality: Offering PC wideband, noise-canceling microphone and hi-fi stereo sound (C325), the Blackwire 315/325 headsets provide a truly outstanding audio experience - making them ideal for voice, music and multi-media. The Dynamic EQ feature optimizes your voice quality when on calls and automatically adjusts the EQ settings when you're listening to music or multi-media. Comfort & Portability: Enjoy the freedom of a secure fit. A lightweight metal headband offers durability and a custom, comfortable fit. Leatherette ear cushions fold flat for easy portability with included carrying case. Dual Connectivity: The Blackwire 315/325 headsets connect to your PC and mobile phone - combining the comfort and durability of corded with the freedom and flexibility to connect to your wireless device through a 3.5mm connection. Ideal for knowledge workers who need a solution for managing calls on their PC, mobile phone or tablet. The Blackwire 315/325 headset offers flexibility at an entry-level price point. Features : Step smartly into UC Dual connectivity Wearing style choice Lightweight design Simple call management Outstanding audio quality Dynamic EQ Carrying case Rapid deployment, future ready Package Contents: Headset Carrying case Users manualYBS