Plantronics Calisto P835-M Speaker Phone with PA50 Wireless Microphone Connects and seamlessly switches between calls from PC, mobile and home* phone A 2.4" color display and a touch sensitive dial pad for easy caller ID viewing, dialing, answering, switching, and muting across devices Use with Bluetooth or corded headsets/headphones (3.5mm). Premium, rich-sounding full duplex speakerphone Wideband audio coupled with advanced noise cancellation technology