The Blackwire 500 Series corded USB (Universal Serial Bus) headsets with Smart Sensor technology intuitively help you manage PC calls – simply put the headset on to answer a call & you’ll hear every word thanks to its premium wideband audio quality. & with ultra-soft leatherette ear cushions & a lightweight headb&, you’ll enjoy all-day comfort & a secure fit. When work takes you on-the-go, simply fold the ear cushions flat, & store in the included carrying case. Durable & portable, the Blackwire 500 Series offers all-day comfort for juggling PC calls & multi-media – providing corded reliability that’s ready when you are. INNOVATIVE, USERFRIENDLY DESIGN • Smart Sensor technology lets you answer a call by simply putting on the headset • One-touch call answer/end, vol +/-, & mute • Inline indicator lights & user friendly audio alerts the user to connection, mute & volume status PREMIUM PC AUDIO • Dynamic EQ automatically adjusts audio settings between voice calls & music • Enjoy hi-fi stereo sound (C520) for unmatched audio clarity when listening to multi-media • PC wideband audio with noise-canceling microphones for high-quality PC telephony • Digital Signal Processing (DSP) provides natural voice sound