[4] The connectors have a lock-snap mechanism allowing 360-degree rotation and usually have a 50 Ω impedance.

[5] MMCX connectors are seen on Wi-Fi PCMCIA cards as antenna connectors or as connectors for external GPS antennas on small devices like PDAs or GPS receivers, or on mobile phones to connect external GSM-Antennas.

They are also used by various brands of in-ear monitors to connect the cable to the individual earpieces.

MMCX is also used in some video transmitters for First-Person View (FPV) radio control piloting.

This makes swapping antennas and repairing easier than the U.FL connectors.