132 x 64 monochrome backlit LCD screen</br>Hard Keys: 12-key dialpad?? home?? speaker?? mute?? headset?? volume</br>High Definition Audio Technology?? Acoustic Clarity Technology</br>Supports Skype for Business?? and Office 365 Cloud PBX</br>Designed for use with PoE (Power over Ethernet) - Power supply not included</br></br>Product Description</br></br>Polycom 2200-40450-001 Features:   - Corded Voice Over IP Phone  - High Definition Audio Technology  - SIP Voice Over Internet Protocol (VoIP)  - 2-Line Operation