With it's 6 line graphical LCD back-lit display the intuitive user interface offers fast access to phonebooks and features. Also it have 6 levels of adjustable handset, headset volume control. The phone has a fully duplex speakerphone which ensures that the conversation will flow both ways without clipping. It also features 24 convenient programmable line buttons, a built in electronic hook switch, wideband compliant, auto redial and navigator key. KX-DT546 Features: 6-Line Operation Hearing Aid Compatible 4 Context-Sensitive Softkeys 6-Line Backlit LCD Display