Professional business starts with the sleek NEC DSX business phones. All NEC DSX business phone models feature the same thin , floating design, two position angle adjustment for effortless viewing, and built in wall mounting. The 22-Button Display offers a large 3 line by 24 character display, four interactive soft keys and a built in speaker phone. The 34-Button display is enhanced with a back-lit display and illuminated dial pad (for improved low light viewing), as well as additional feature keys. An advanced model of the 34-Button Display provides a built in full-duplex speaker phone. The 34-Button Super Display has all the features of the advanced 34-Button Display and additionally offers the user a 9-line-by-24 character display and 12 interactive soft keys. Rounding out the line, the DSX Cordless Telephone provides mobility and flexibility for those who spend much of the day away from there desk. Complemented by 4 fully programmable Feature keys the DSX Cordless Telephone achieves a whole new level of convince and mobility. You will know that you have made a good choice when you start using them!