Overview : Blackwire 500 Series: Corded reliability that’s ready when you are: Meet the Blackwire® 500 Series corded USB headsets with our industry-first Smart Sensor™ technology. It easily and intuitively juggles PC calls and multi-media using audio alerts to manage connection, mute and volume status. With easy portability, it offers premium hi-fi stereo audio (Blackwire 520) and all-day comfort at your desk or at home. Smart Sensor Technology: Experience industry-first Smart Sensor™ technology that lets you answer a call by simply putting on the headset - making it the most productive and versatile corded headset on the market. Superior Audio Quality: Offering PC wideband, noise-canceling microphone and hi-fi stereo sound (C520), the Blackwire 500 Series provides a truly outstanding audio experience - making it ideal for conference calls, webinars, listening to music and other 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 And Portability: Ultra-soft leatherette ear cushions and lightweight headband mean all-day comfort and a secure fit. Features ear cushions that fold flat, and includes a high-quality carrying case for easy storage and portability. Package Contents: Headset Carrying Case ManualYBS