A:AnswerThe LG G4 actually utilizes a SlimPort. This means you will need a SlimPort adapter instead of an MHL adapter. Currently Rocketfish does not make a SlimPort adapter.
A:AnswerHello Djhighme, the MHL technology has its compatibility list available for the public at http://www.mhltech.org/devices.aspx if your device is listed there the adapter will work for it with no problems. Omar S. - Rocketfish Support.