Alphanumeric Display 3 line with a 16 character display provides useful information such as absent messages, call status, date & time, & call duration. Caller ID is available with an optional card.24 Programmable Keys 24 programmable keys for one touch access to features & automatic dialing. 12 of the 24 programmable keys are equipped with LEDs & can be programmed to direct select a Central Office line or Direct Station Select (DSS). A Busy Lamp Field (BLF) shows which extensions are in use. Incoming Call/ Message Lamp This large, easy-to-see lamp announces incoming calls or messages, so youll always know whose telephone is ringing -even from a distance. Navigator Key For quick adjustment of the volume & display contrast. Speakerphone Speakerphone for hands-free convenience. Dial or talk without picking up the handset. Auto Answer/ Mute Auto Answer: For use with intercom calls. Mute: Listen without being heard.