Plantronics Calisto P540-M PC-powered desk phone Designed for use with Microsoft Office Communicator 2007/Microsoft Lync 2010 USB plug-and-play (Connects to PC via USB) Wideband audio Backlit LCD display shows incoming caller ID, time, and user's online status/presence Volume control Mute key that lights up when activated Speakerphone SoundGaurd technology Headset port (compatible with Plantronics H top headsets and 27190-01 cable) PL8278301
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