Plantronics Blackwire C720 (87506-02) BIN Headset . The Blackwire 700 series is the singular UC (Unified Communications) headset that combines corded reliability with wireless flexibility. Enjoy seamless call management and industry-first Smart Sensor technology for unprecedented ease of use; answer a call by simply putting on the headset or pause mobile device media playback by taking it off. Advanced noise-cancelling Digital Signal Processing wideband PC audio and hi-fi stereo sound create unmatched audio quality and the detachable cable enables you to take your mobile calls throughout the office. With up to 10 hours of talk time and a versatility that connects to all the devices in your work life the Blackwire 700 series is the most integrated premium headset for UC. Smart Sensor technology lets you answer a call by simply putting on the headset