LOL! That's what I returned. The mouse never worked at all and the keyboard quit this morning. So I got an identical keyboard except that it has a cord. I don't mind because I have an extension so I can type with it in my lap. And I really didn't need a mouse. I am quite happy with my trackball mouse for now.
You have to put batteries in them and plug in the sensors...LOL
I was stumped about a month ago when my cursor froze. I tried everything... except replacing the batteries in the mouse!