3.5 “graphic LCD display module with 4 backlit function keys. The electronic index function for displaying and calling system users is integrated. It must be connected to the audio module CA2124AB or audio-video CV2124AB (for Duo System) or AB3G (for MyCom systems) and can also be combined with the PD2100AB keyboard module. Capacity is 1000 users, to each of which the address of the internal device of the system must be associated in case of Duo System systems, or the code relative to the telephone number to call, in MyCom systems. If associated to a PD2100AB keypad, each user can also be assigned a password to activate one or more of the possible activations. In addition, the “Alias” feature is included in the phonebook. When used in combination with XE2921 it can display curent data and time, moreover it is possible to program PIN access codes according to various time schedules.