Cisco CP-7937G Unified IP Conference Station VoIP phone POE, Requires Cisco Communications Manager Superior wideband acoustics with the support of the G.722 wideband codec Support for IEEE Power over Ethernet (PoE) or the Cisco Power Cube 3 (Sold Separately). Expanded room coverage up to 30 feet by 40 feet with the optional external microphone kit (Sold Separately). Support for a third-party lapel microphone kit. Large Backlit LCD (255 x 128 pixels). Requires Cisco Unified Communications Manager (Sold Separately).