It is an additional wire for above phones to connect with Griffin Box, Twister Flasher, Tornado Box ( UFS2, UFS3 ) and all other boxes with compatible RJ45 socket.
Compatible with: LG KE500, KE508, ME550 - FLASH, KP110, KP115, KP130, KP199, KP210, KP215, KP220, KP230, KP235