Manufacturers direct MMCX headphone special female plug shuer bluetooth special connector (MMCX-50KE-1)
MMCX connectors are coaxial RF connectors similar to MCX but smaller.
The RF coaxial SSMC female connectors have a lock-snap mechanism allowing 360-degree rotation and usually have a 50 Ω impedance.
They offer broadband capability from DC to 6 GHz MMCX connectors are most commonly seen on Wi-Fi PCMCIA cards as antenna MMCX Connector for Earphone Cable or as connectors for external GPS antennas on small devices like PDAs or GPS receivers.
MMCX connectors are also used by various brands of in-ear monitors to connect the cable to the individual earpieces.
This allows for the cables to be replaced or swapped.