FS II Digital wireless base station: FreeSpeak II Digital license-free wireless base station. Supports up to 25 Beltpacks and 10 antennas. (Two antennas can connect to the base station directly or up to 10 antennas can be connected by using two x FSII-SPL splitters) The base station has connections for four party-lines and four 4-wires plus a dedicated SA output and dedicated program audio input. XLR-4 pin male headset connection. To use the fiber connections to the FSII-SPL Splitter please choose suitable SFP transceivers from either HLI-MMFO or HLI-SMFO.Please note: SFP modules can vary in electrical capabilities despite being mechanically compatible. Clear-Com can only support Clear-Com supplied SFP transceivers which have been tested with Clear-Com products.