AT&T CL80101 Accessory Cordless Handset, Silver | Requires an AT&T CL81101, CL81201, CL81301, CL82101, CL82201, CL82251, CL82301, CL82401, CL82451, CL82501, or CL82601 Expandable Phone System to Operate High-contrast backlit LCD and lighted keypad. English/Spanish/French setup menu. DECT 6.0 digital technology. Intercom between handsets. NOTE: Compatible with AT&T models CL81101, CL81201, CL81301, CL82101, CL82201, CL82251, CL82301, CL82401, CL82451, CL82501, and CL82601 Conference between an outside line and up to 4 cordless handsets. 50 name and number phonebook directory. 9 number speed dial. Any key answer. Mute. Voicemail waiting indicator. Quick access key for voicemail box. Last 10 number redial.