Simplifies call control on the display using softkeys for everyday functions. Improves flexibility through support of a secondary Ethernet port for a PC as well as Bluetooth and DECT Headsets. Supports up to three 12 or 24 Button Expansion Modules for more efficient, high-speed call management. Offers consistency through a common Avaya one-X® interface (including mobile endpoints). Supports reduced energy consumption and costs through Power-over-Ethernet and sleep mode. Comes with monochrome display – 3.2 inches x 2.2 inches (8.2 cm x 5.5 cm).