Avaya EU24 Key Feature Expansion Unit

24 button expansion module with display. A single EU24 is supported with the following phones: * 2420/5420 Digital Phone * 4620/5620 IP Phone * 4621/5621 IP Phone * 4625 IP Phone Requires a 1151D1 or 1151D2 power supply unit for the phone including for IP phones using Power over Ethernet (PoE).