EL651 sound module

For Nexa push buttons door panels. 
4+n analogue installation. 
For systems with several access doors. 
External switching units are not required. 
Sound module with independent door panel and telephone adjusting level volume. 
Removable terminal connector for easy wiring. 
Two selectable electronic call types, allowing the tenant to distinguish which door panel is calling. 
Acoustic acknowledgement signal. 
While busy channel conditions, acoustic tones are reproduced on the door panel if someone tries to make a call. 
Handset hang recognition that removes busy channel fixed times. 
Connection to push button modules using small flat cables provided with the modules. 
Includes two push buttons.