AT&T CL82203 DECT 6.0 Expandable Cordless Phone with Caller ID/Call Waiting and Digital Ansewering , 2 Handsets, Silver/Black DECT 6.0 Digital technology Push-To-Talk for instant and easy communication between handsets HD Audio,Handset Speakerphone Call Transfer Using Intercom Expandable Using CL80103 DSL Subscribers may need to us a DSL Filter For optimal performance batteries should be charged for 16 hours prior to use