Mitel 9184-000-200 Superset 4DN Speaker Display Phone (Refurbished)Key Features: Twelve line selection or speed dial keys, a line status display, interactive softkeys, and four supplemental keys 13 speed dial keys 2 way speakerphone transfer conference key, hold key, and redial key Requires Generic 1002 LTW 16 on SX 200D Light systems Requires MS2004 00 or higher on Mitel SX 2000 systems One available port is required from a DNIC card on any of the systems above