The Cisco 7841 IP phone has a 10/100/1000 Ethernet switch, 4x programmable function keys, headset connection, EHS and a monochrome display. The most important function keys are displayed on the front of the phone. - Backlit 3.5" monochrome graphical display with 396 x 162 resolution - 4x telephone numbers/lines - 4x programmable function keys - 4x context sensitive soft keys - Speakerphone - RJ11 headphone jack - Electronic Hook Switch (EHS) - G.722 wideband audio - Integrated 10/100/1000 Ethernet switch - Dedicated keys for headphones, speakerphone, microphone mute, call forwarding, conference call, call park, phone directory, messages and settings - PoE Class 1 <3.84 W PoE device (power adapter or cable not included, see accessories) A Unified Communications Manager is required for use.