BM 3804 is a desktop paging 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. Up to four BM 3804 paging microphones (interlocked one another) can be linked (daisy-chained) to the line. The first BM 3804 paging microphone (of the line) is 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).