The Neutrik RT4 FC-B is a tiny mini XLR connector 3-pin (female). These connector types are used by Shure, Beyerdynamic, Line6 etc. on their bodypacks and mini microphones. It has a black housing, and golden connections. Soldering is n problem, but the locking mechanism is very fiddly and doesn't work verly reliable. I prefer Switchcraft connectors which are a little bit more expensive.