The JVC OpticalCON Duo Fiber Coupler Adaptor is used to extend the transmission distance between the GY-HM790 camera and the base station. It is based on standard optical LC-Duplex connection. The unit has an all-metal connector that couples tactical or hybrid cables offered by JVC, and offers easy field servicing. The weather-proof adaptor has 4 integral copper conductors that connect SMPTE hybrid fiber cables used to carry power.