Fully Duplex Speakerphone Fully Duplex speakerphone means that the conversation on the Panasonic KX-T7630 will flow both ways without clipping. On some handsfree telephones the speaker & the microphone can not function at the same time resulting in the end of conversations being cut off. Alphanumeric Display A huge 6 line LCD display makes navigating the menus & reading onscreen information very easy indeed. The LCD is also backlit so even in areas where lighting is not good it is easy to read.24 Programmable Keys On the right hand side of the system telephone are two columns of keys that can be programmed to the users preference. These buttons can be set to show other extensions on the Panasonic telephone system, or the different telephone lines. The dual coloured LED lights on these keys make it easy to see if the extension or phone line is in use at a glance. Navigator Key For quick adjustment of the volume & display contrast.4 Tilt Positions Four tilt positions so the phone can be altered to the angle best to see the LED lights & also the LCD screen it has.