The es100 does not seem to me a wise investment because it can be broken unintentionally. At some point you will probably unintentionally unlock the audio output. And then ... Murphy's Law ... you accidentally pull the audio jack during audio playback. In any case, I think it's so great again that as a buyer you are only informed about a side note about this matter ... I think many people do not even use the app, and then they do not even know about this warning audio output lock thing modest.