You"ll love that this Uniden Caller ID/ Call Waiting capable phone has DECT 6.0 technology. That"s the best clarity available! If you subscribe to Caller ID/ Call waiting through your local phone company this phone will hold 50 names and numbers. With or without Caller ID/ Call Waiting the phone can hold up to 100 names and numbers in its phone book. It"s easy to multitask with this phone because of its handset speakerphone and because you can intercom other phones within the system and can transfer calls between phones. It"s expandable up to 12 handsets with using only one phone jack and is compatible with the Uniden DRX100 range extender. The message waiting indicator light on your handsets will tell you when there"s a new voice mail. The Eco-mode automatically manages your power consumption for a longer battery life. Need some quiet time? Silence all ringers at once with a quick touch of the button.