Ericsson Dialog 4222 Office Telephone has 13 LED keys and provision for an attachable key panel. It's hands free, with programmable ringer, loudness and tone character, as well as an integrated headset port and a dedicated headset key. Programmable keys 4 Loudspeaker Programmable ringer volume Line access 2 Inquiry key Message Waiting Indicator Mute function Volume control Headset port and key Graphical display 128 x 25 pixels Option unit connection Warranty 1 year