At least I can read and comprehend what is written. Sometimes it helps when it comes to drawing conclusions so I suggest you give it a try.
Ps. If that is still not clear, here is a picture of the special edition back cover for J1. And yes it is a TOH, like every other thing that attaches in the phones back. Same as j2.
All these confusions are about same thing with different wordings 
young people don’t know anymore what a back cover is, because in the last decade(s) there are not so much devices with removable back cover on the market. 
Old people, who still know what a “back cover” is, or what on earth a “hierarchical file system” is and that you can store data on “save icons” (albeit not a lot)
