The Alarm Equipment Series feature a loud and clear alarming noise incase of fire and danger signal. They are powered by FDnet/C-NET without the need of a supplementary power supply. Their mounting capacity are extended through wall, ceiling, corridors, staircase, and other scape route areas. They also have available bases that can be ordered separately. And for surface source line up to cable 6 mm in diameter with base FDB221, the base attachment or the wet base attachment can be used.