The Plantronics Blackwwire C320-M has been discontinued by the manufacturer. The direct replacement is the Blackwire C3220
Offering PC wideband, noise-canceling microphone and hi-fi stereo sound, the Blackwire 320-M provides a truly outstanding audio experience – making it 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. Works on all UC Platforms but is optimised for Lync/Skype/sfb.