Dect 6.0, 2 Line Expandable Cordless Phone, With Digital Answering System & Caller ID, Expandable Up To 12 Handsets Using DS6101, Digital Answering System Includes Mailbox For Each Line, Intercom Between Handsets, Transfer Calls Between Handsets, 50 Name & Number Phonebook, Additional Keypad On Base, ROHS Compliant, Energy Star.