Ideal for all-day use, long conference calls and listening to multimedia Noise canceling microphone masks nearby talkers for maximum call privacy Available in monaural (Blackwire 5210) or hi-fi stereo with passive noise reduction (Blackwire 5220) Universal USB Connectivity to smartphone and tablet via 3.5 mm One-touch call answer/end, volume +/- and mute PC wideband audio with noise-canceling microphones for high-quality PC telephony Plantronics Manager Pro, an additional purchase, enables your IT team to gain insight into every compatible Plantronics headset being used company-wide