Audio-video module, Alba door station line, including electric door speaker and wide angle camera, ready for the installation of 1 or 2 buttons (art. AB20 or AB21) up to 4 calls if programmed in double-call way. To be completed with item AB21 or AB20.
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.