The Cisco 8831 is an advanced IP conference phone for use with your Cisco Unified Communications Manager system. It provides superior wideband (HD) audio, 360 degree coverage, an easy-to-use control panel, and backlit display. By adding optional wired or wireless expansion microphones, the Cisco 8831 can accommodate larger conferencing tables or conference rooms. Cisco 8831 Features Large high-resolution backlit display - 3.5 inch (396 x 162 pixels) Superior wideband acoustics with the first two-element speaker in a conference phone; this feature allows the phone to capture the full voice spectrum without having to compromise with a single-element speaker Detached control panel so that the display may be easily viewed without having to move the entire unit Supports expanded room coverage with optional daisy chaining of two units Supports optional wired or wireless (DECT) expansion microphones Powered via Power over Ethernet (802.3af PoE), optional Power over Ethernet Injector, or optional Power Cube 3 (PoE injector and Power Cube 3 sold separately