Use this Uniden phone to expand the number of D1660, D1680, D1685 or D1688 series phones you have in your house. You"ll love that this Uniden Caller ID/ Call Waiting capable accessory 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. 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 if you to stretch your range. 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.