Audio module for Alba door station line. It includes electric door speaker and it is ready for the mounting of 1 or 2 buttons (art AB20 or AB21) up to 4 calls if programmed in double call way. To be completed with article AB20 or AB21.
It manages the system "Duo extended" range for installations up to 20.000 users and 250 m as max distance between door station and internal station. It is self powered with automatic address learning.