Thought I would start a thread to put this out there, since I know a number of people are confused or uncertain about which MHL adapters work with the S4. Firstly, the S4 uses an 11-pin MHL configuration, as the S3 and Note 2 did. Secondly, it is the first MHL 2.0 spec device. MHL 2.0 adapters do not require a charging input, however if you do have one connected they double the charging power going into the connected device (hopefully will finally solve the issue of power slowly dissipating when using MHL). They also increase output to 60Hz/60fps from 30hz on MHL 1.0 spec devices. Apparently 3D content can now be mirrored too. I have tested it a little today and can confirm the following: S3/Note 2 11-pin MHL adapters will work with the S4 also, older 5-pin adapters will not (you can get an adapter to allow them to work though). The Smart Dock also works with the S4. The S4 MHL 2.0 adapter does indeed work without a charging input. Hope this helps.