ELA-402 door loudspeaker with call generator EB 1+n black. Built-in door electronics Built-in door electronics for door constructions, intercoms or mailbox systems for installation in intercom systems according to DIN EN 50486 in 1+n technology. Built-in device consisting of built-in door loudspeaker, volume control for microphone/loudspeaker and integrated alpha tone generator for electronic call.
