Plantronics Blackwire C710 (87505-02) UC headset. The Blackwire 700 Series is the versatile UC headset that offers high-quality PC audio and seamless Bluetooth connectivity to mobile phones and tablets. Enjoy unmatched audio quality industry-first Smart Sensor technology that automatically answers a call when you put on the headset and a detachable cable for taking your mobile calls throughout the office. Battery meter conveniently displays headset battery life remaining in PC icon tray