It fits directly into the jack on the earphone. 00 earbuds but I?ll give it a 4. I moved into a new place with no towel bar in the bathroom & looked at hanging rack sets. A hanging towel won?t cover it, can?t turn the bracket around bc the way the screw holes are recessed cut. At this point I can?t speak to the long term use of the unit, but early battery performance has been fantastic! These are easier than some Ive owned. A very comfortable shoe These collars fit on my curl bar, my threaded barbell, my 5 barbell, my threaded barbell, my threaded dumbells, and my 400lb capacity barbell. On one set, the listener could hear me, but also hear constant crackling. My most recent purchases have been for a large folding table that I have my Ham Radio gear on in my office.