DECT 6.0 2 Line Expandable Digital Cordless Phone with All-Digital Answering System Dual Keypads Call Block Night Mode Talking Caller ID/Talking Alarm Clock/Talking Battery Alert Light-Up Indicator and 2 Handsets Black Metallic finish. DECT 6.0 (Digital Enhanced Cordless Telecommunications) technology lets you move freely around your home with long range and amazingly clear sound. It also assures greater protection against eavesdropping for all your calls. Operating in the 1.9GHz frequency range your phone will not conflict with other wireless devices such as computer routers wireless keyboards microwave ovens and other common household devices. Perfect for home or business two-line operation means you can conference in two outside lines to have a three-way conversation. Or place your current call on hold to make another call. Power outage? No problem. The corded handset works even when the electricity doesn't. Enjoy peace of mind knowing you can make calls even when the power goes out. (Corded handset Line 1 only.) Now you can program each handset to ring -- or not -- at your discretion. Before going to sleep simply set the bedside handset to Night Mode so that it won't ring in your bedroom. In the meantime the handset in the den will still ring when that important call comes in without disturbing the person who's sleeping. With two handsets included and the option of adding up to four additional handsets -- all while using only one base and one phone jack -- go ahead and put one in the den the kitchen the master bedroom and the living room so you won't have to make a run for it when the phone rings.