Designed for the enterprise user, this fully-featured desktop phone offers flexibility and reliability for those with heavy phone and network requirements.Support for up to 24 lines when connected to an expansion moduleLarge 3.5" color backlit LCD display6 programmable keys4 programmable context sensitive keysOptional detachable keyboard and expansion modulesGigabit throughput for PC connectivityFlexible headset support (wireless, DHSG/EHS and USB)