Panasonic KXTG4000B 2.4 GHz DSS 4-Line Cordless Phone with Caller ID and Voicemail 2.4 GHz digital spread spectrum operation Supports 4 lines; expands to 8 handsets Caller ID/call waiting with 50-call history on base, 30 on handset 100-minute voicemail system with auto attendant and 8 mailboxes 2-way intercom/paging, lighted handset keypad, headset jack