Here are the details of the KX-T 7633 - White. Fully Duplex SpeakerphoneFully Duplex speakerphone means that the conversation on the Panasonic KX-T7630 will flow both ways without clipping. On some handsfree telephones the speaker and the microphone can not function at the same time resulting in the end of conversations being cut off.Alphanumeric Display 3 line backlight LCD provides useful information such as absent messages, call status, date and time, and call duration.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 KeyFor quick adjustment of the volume and display contrast.4 Tilt PositionsFour tilt positions so the phone can be altered to the angle best to see the LED lights and also the LCD screen it has.