Just wanted to chime in here and be a point of support if any of you all need it or have any general questions.
For the Micro iDSD, correct, there is no actual off switch. All you need to do is a full turn counter clockwise. I also personally recommend leaving them disconnected in general as well, especially for power saving reasons on the device itself when you are not listening to it.
Let me know how else I can be of assistance!