The Avaya EU24 is a 24 button backlit display expansion module for compatible 2400, 4600, 5400 and 5600 series sets. It supplies 24 additional line and feature keys. One EU24 is supported per phone. Requires local power (1151C1 or 1151D1).
Compatible with 2420, 4620, 4620SW, 4621SW, 4625SW, 5420, 5620SW, 5621SW.