This is an update to my review of 3/27/2015. I had issues connecting a wired source, and the unit would shut off without rhyme or reason. I solved these by just increasing the volume of my source, and now these are reliable and easy to use. I bought two based on reviews on other sites.
Now that I've had this for a few days, I have worked out the issues I had; The unit can be operated by internal battery, so there is an auto-shutoff if no sound is present
1; The unit came without any instructions; Visit the Sony eSupport site and under "manuals" look at the Help file; 2; The unit will auto-shutoff if the source material is played at low volume