This item is in-line connector specifically designed to join together two fibre optic cables used on the M.O.S.T fibre optic ring

found in BMW, Mercedes, Porsche, Audi , Jaguar, Land Rover & VW vehicles. OEM part number for this connector For bmw is 61136906535.

M.O.S.T stands for (Media Orientated Systems Transport) fibre optic ring and is used by European vehicle manufacturers to interconnect the audio/visual equipment within their vehicles.