BM 3804FM is a wall mount emergency microphone exclusively dedicated for the RCF DXT 3000 system. It can be directly connected to the MX 3250 main unit through a fourpair J-type fire-rated cable. If more than one console are connected to the system (interlocked one another), in daisy-chained link, BM 3804FM shall be the first one, configured as emergency microphone and directly powered by the MX 3250 main unit, while the second, the third and the fourth need 24V dc adapters (500mA, i.e. RCF AC AD 2405, optional).