VTech CS6859-2 DECT 6.0 Expandable Cordless Phone with Answering System and Dual Caller ID/Call Waiting, Silver/Black with 2 Handsets DECT 6.0 Digital technology Caller ID/Call Waiting*-stores 50 calls Quiet Mode ECO Mode power-conserving technology Backlit cordless handset keypad and display Expandable up to 5 handsets with only one phone jack For optimal performance batteries should be charged for 16 hours prior to use DSL Subscribers may need to us a DSL Filter