AT&T EL52100 DECT 6.0 Cordless Phone with Digital Answering System and Caller ID, Handset Speakerphone, Wall-Mountable, Silver/Black DECT 6.0 Digital Technology Handset Speakerphone, Lighted Keypad on Handset Large Lighted Display on Handset, 50 Name/Number Caller ID History DSL Subscribers may need to us a DSL Filter For optimal performance batteries should be charged for 16 hours prior to use. Please refer the User Manual before use.